| S2021E01 |
The Deepest Holes Ever Dug
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January 2, 2021
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| S2021E02 |
The Most Expensive Movie Sets Ever Made
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January 5, 2021
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| S2021E03 |
The Begich Towers: A Real Life Arcology
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January 7, 2021
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| S2021E04 |
The Most Iconic Weapons of the Vietnam War
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January 9, 2021
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| S2021E05 |
Millennium Tower: San Francisco's Sinking Skyscraper
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January 12, 2021
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| S2021E06 |
The Original Seven Wonders of Antiquity
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January 14, 2021
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| S2021E07 |
Jubail, Saudi Arabia: The World's Largest Industrial City
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January 16, 2021
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| S2021E08 |
American Carnage: The Deadliest Days in American History
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January 19, 2021
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| S2021E09 |
America's Most Impressive Ancient Ruins
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January 21, 2021
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| S2021E10 |
The Most Powerful Engines Ever Built
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January 23, 2021
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| S2021E11 |
The Presidential Helicopter: A $4 Billion Mistake
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January 26, 2021
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| S2021E12 |
5 Incredible Cities that Were Built from Scratch
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January 28, 2021
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| S2021E13 |
5 of the Most Expensive Military Craft Ever Made
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January 30, 2021
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| S2021E14 |
MV Doña Paz: The Deadliest Maritime Disaster in History
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February 2, 2021
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| S2021E15 |
Weapons and Technology of the American Civil War
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February 4, 2021
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| S2021E16 |
Largest WPA Projects During the Great Depression
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February 6, 2021
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| S2021E17 |
Tokyo's Futuristic Underground Flood System
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February 9, 2021
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| S2021E18 |
Lesser Talked About Ancient Marvels, Part 3
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February 11, 2021
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| S2021E19 |
The Big Bangs: History's Worst Industrial Disasters
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February 13, 2021
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| S2021E20 |
Unexplained America: Strange Mysteries and General Weirdness from the USA
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February 16, 2021
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| S2021E21 |
Military Masterpiece: Caesar's Bridge Across the Rhine
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February 18, 2021
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| S2021E22 |
The Most Mysterious Missing Ships
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February 20, 2021
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| S2021E23 |
Gothic Legislatures: Five of The World's Most Magnificent Parliament Buildings
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February 23, 2021
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| S2021E24 |
The Deadliest Weapons of World War I
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February 25, 2021
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| S2021E25 |
5 Incredible Examples of Ancient Engineering
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February 27, 2021
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| S2021E26 |
5 of History's Greatest Warships
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March 2, 2021
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| S2021E27 |
5 Wonders of the Underwater World
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March 4, 2021
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| S2021E28 |
Inexplicable Items: 5 Mysterious Ancient Artifacts
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March 6, 2021
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| S2021E29 |
5 Ancient Mysteries We Still Haven't Solved
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March 9, 2021
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| S2021E30 |
Project Chariot: Building a Harbor With Nuclear Bombs
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March 11, 2021
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| S2021E31 |
4 of America’s Most Impressive Historic Forts
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March 13, 2021
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| S2021E32 |
The Halifax Explosion: Canada's Massive Early Modern Naval Disaster
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March 18, 2021
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| S2021E33 |
5 Lesser Known Military Ships and Boats
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March 20, 2021
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| S2021E34 |
Tacoma Narrows Bridge: The Washington State Bridge that Blew Over
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March 23, 2021
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| S2021E35 |
M65: The Atomic Cannon
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March 25, 2021
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| S2021E36 |
5 of the World's Most Unique But Lesser Known Architectural Marvels
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March 27, 2021
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| S2021E37 |
Mysterious Artifacts That Defy Explanation
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March 30, 2021
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| S2021E38 |
Lesser Known Encryptions that Defy Explanation
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April 1, 2021
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| S2021E39 |
5 of America's Most Unique Buildings
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April 4, 2021
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| S2021E40 |
The 7 Wonders of the Medieval World
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April 6, 2021
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| S2021E41 |
Veryovkina Cave: The Deepest Cave in the World
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April 8, 2021
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| S2021E42 |
Lesser Known Aviation Mysteries
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April 10, 2021
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| S2021E43 |
The Remarkable Innovations of Ancient China
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April 13, 2021
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| S2021E44 |
Abandoned After the Olympics: Greece's $11 Billion Mistake
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April 15, 2021
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| S2021E45 |
The World's Deadliest Construction Projects
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April 17, 2021
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| S2021E46 |
The 8th Wonder of the World: The Rock-Hewn Churches of Lalibela
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April 20, 2021
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| S2021E47 |
Epic Castaway Tales
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April 22, 2021
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| S2021E48 |
Arcosanti: A Revolutionary Model of Super-Dense Urban Living
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April 24, 2021
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| S2021E49 |
China's Replica Cities: How China Recreated Famous Western Destinations
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April 27, 2021
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| S2021E50 |
America's Most Fascinating Hidden Treasure Mysteries
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April 29, 2021
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| S2021E51 |
The Biggest Flops in Automotive History
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May 1, 2021
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| S2021E52 |
The Dead Sea Scrolls: The Greatest Archaeological Find of the 20th Century
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May 4, 2021
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| S2021E53 |
In Which Ways do Movies Get Ancient Warfare Wrong?
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May 6, 2021
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| S2021E54 |
Incredible Ancient Tombs, Temples, and Forts That You've Never Heard Of
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May 8, 2021
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| S2021E55 |
Citigroup Center: The Skyscraper that Could Have Fallen Over
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May 11, 2021
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| S2021E56 |
18 Excellent Archaeological Facts
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May 13, 2021
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| S2021E57 |
The Loudest Sounds in History
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May 15, 2021
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| S2021E58 |
MAXIMUM EFFORT! The Story of How Guinness Became the Arbiter of World Records
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May 18, 2021
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| S2021E59 |
Beyond the Seven Wonders: The Handful of World Marvels Snubbed from World Wonder Lists
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May 20, 2021
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| S2021E60 |
5 Weapons Well Ahead of their Time
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May 22, 2021
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| S2021E61 |
How Deep Could We Dig?
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May 25, 2021
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| S2021E62 |
5 of the Strangest Places on Earth
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May 27, 2021
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| S2021E63 |
Incredible Ancient Egyptian Queens
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May 29, 2021
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| S2021E64 |
The US Strategic Defense Initiative: Ronald Reagan's Star Wars Program
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June 1, 2021
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| S2021E65 |
The Rio-Antirrio Bridge: The Most Challenging Bridge Ever Built
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June 3, 2021
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| S2021E66 |
The Warsaw Radio Mast: Recounting That Time the World's Tallest Structure Collapsed
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June 5, 2021
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| S2021E67 |
Extreme Survival Tales
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June 8, 2021
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| S2021E68 |
Franja Hospital: The Secret Mountain Hospital of WWII
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June 10, 2021
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| S2021E69 |
The Rosetta Stone: Bringing Ancient Egypt Back to Life
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June 12, 2021
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| S2021E70 |
Monument to the Third International: The Crazy Skyscraper Planned for the Soviet Government
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June 15, 2021
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| S2021E71 |
5 More Ancient Mysteries We Still Haven't Solved
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June 17, 2021
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| S2021E72 |
4 of the Worst Aircraft of All Time
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June 19, 2021
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| S2021E73 |
Why Did So Many Different Cultures Build Pyramids?
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June 22, 2021
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| S2021E74 |
The Most Expensive Movies Ever Made And Why
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June 24, 2021
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| S2021E75 |
5 Grizzly "Survival Cannibalism" Stories
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June 26, 2021
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| S2021E76 |
Underground America: Caves, Craters, Lairs, and Bunkers
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June 29, 2021
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| S2021E77 |
Pripyat: The City Made Uninhabitable By Chernobyl
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July 1, 2021
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| S2021E78 |
Five of the World's Worst Prisons
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July 3, 2021
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| S2021E79 |
History's Most Wasteful Military Spending
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July 6, 2021
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| S2021E80 |
The Blue Peacock: The Chicken-Heated Nuclear Land Mine
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July 8, 2021
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| S2021E81 |
The Invisible Women of Science: Discoveries the Nobel Prize Ignored
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July 10, 2021
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| S2021E82 |
Abandoned Arenas in the Amazon: The Aftermath of Brazil's 2014 FIFA World Cup
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July 13, 2021
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| S2021E83 |
Hobart's Funnies: D-Day's Weird and Wonderful Tanks
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July 15, 2021
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| S2021E84 |
Expeditionary Fighting Vehicle: The Marine Corps' $3.3bn Mistake
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July 20, 2021
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| S2021E85 |
Beijing 2008: The Most Expensive Olympics Ever
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July 22, 2021
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| S2021E86 |
Hashima Island: Japan's Abandoned Coal City (In the Ocean)
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July 24, 2021
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| S2021E87 |
Four of the World's Most Notorious Art Forgers
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July 27, 2021
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| S2021E88 |
Abandoned, Expensive, or Imploded: The Wasteful World of Olympic Facilities
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July 29, 2021
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| S2021E89 |
Five of History's Weirdest Cars
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July 31, 2021
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| S2021E90 |
What Were They Thinking?! Seriously Dangerous Toys
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August 3, 2021
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| S2021E91 |
5 of the Most Daring Heists of All Time
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August 5, 2021
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| S2021E92 |
The Mask of Tutankhamun
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August 7, 2021
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| S2021E93 |
The World's Eeriest Ghost Cities
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August 10, 2021
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| S2021E94 |
Some of the World's Rarest and Most Bizarre Diseases
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August 12, 2021
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| S2021E95 |
More Archaeological Facts!
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August 14, 2021
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| S2021E96 |
The British Museum: A Collection of Other People's Stuff
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August 17, 2021
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| S2021E97 |
Project Pluto: The Nuclear-Powered Cruise Missile
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August 19, 2021
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| S2021E98 |
The Terracotta Army
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August 21, 2021
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| S2021E99 |
5 of History's Absolute Strangest Military Units
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August 24, 2021
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| S2021E100 |
Stupid Inventions That Somehow Made Millions of Dollars
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August 26, 2021
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| S2021E101 |
The 20th Century's Most Deadly Medicines and Chemicals
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August 28, 2021
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| S2021E102 |
536: The Worst Year Ever
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August 31, 2021
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| S2021E103 |
The Mysteries of King Tut's Tomb
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September 2, 2021
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| S2021E104 |
The Green Line: Why Cyprus is Currently Split in Two
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September 4, 2021
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| S2021E105 |
History's Most Macabre Archaeological Discoveries
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August 7, 2021
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| S2021E106 |
XF-85 Goblin: The Jet-Powered Parasite Fighter
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September 9, 2021
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| S2021E107 |
The Most Prolific Hitmen in the History of Organized Crime
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September 14, 2021
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| S2021E108 |
Varosha: Cyprus' Abandoned Tourist Town
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September 16, 2021
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| S2021E109 |
Lost with the Titanic: 5 Treasures that Sank with the Ship
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September 18, 2021
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| S2021E110 |
The Lethal Tank Destroyers (Not Tanks) of World War II
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September 21, 2021
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| S2021E111 |
Groundbreaking Aircraft of Yesteryear
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September 25, 2021
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| S2021E112 |
High and Fast: The Republic P-47 Thunderbolt
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September 28, 2021
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| S2021E113 |
Future Combat Systems: The Abandoned US Weapons Platform That Cost $18.1 Billion Dollars
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September 30, 2021
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| S2021E114 |
5 Archaeological Finds We Still Can't Explain
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October 2, 2021
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| S2021E115 |
Operation Cyclone: Let’s Go to Afghanistan! What could go wrong?!
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October 5, 2021
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| S2021E116 |
Bizarre Military Inventions That Never Saw Service
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October 7, 2021
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| S2021E117 |
Life Changing Inventions That Were Ridiculed at First
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October 9, 2021
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| S2021E118 |
A Fork-Tailed Devil: The P-38 Lightning
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October 12, 2021
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| S2021E119 |
5 Strange Cases of Mass Hysteria
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October 14, 2021
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| S2021E120 |
The Mysteries of Angkor Wat
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October 16, 2021
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| S2021E121 |
Epic Military Blunders
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October 19, 2021
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| S2021E122 |
Vozrozhdeniya "Rebirth" Island: The Soviet Union's Bio Weapons Lab
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October 21, 2021
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| S2021E123 |
The Biggest Abandoned Ships from Around the World
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October 23, 2021
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| S2021E124 |
Creepy Archaeological Discoveries
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October 26, 2021
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| S2021E125 |
Rogue Waves: The All-Too-Real Tsunamis of the Seas
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October 28, 2021
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| S2021E126 |
Forgotten Warbirds of the Early Jet Age
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November 2, 2021
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| S2021E127 |
What was Life Like for Women in the USSR?
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November 4, 2021
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| S2021E128 |
History's Most Influential Ideas
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November 9, 2021
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| S2021E129 |
The Incredible Abandoned Monuments to Communism
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November 11, 2021
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| S2021E130 |
Operation Jericho: The World's Least Conventional Prison Break
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November 13, 2021
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| S2021E131 |
Weird Historical Coincidences
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November 16, 2021
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| S2021E132 |
More Creepy Archaeological Discoveries
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November 18, 2021
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| S2021E133 |
Mystical Objects That the Vatican Might Be Hiding
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November 20, 2021
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| S2021E134 |
Operation Mount Hope III: When America Stole a Russian Attack Helicopter
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November 23, 2021
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| S2021E135 |
Incredible Tsunami Warning and Prevention Systems
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November 25, 2021
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| S2021E136 |
Weird and Creepy Abandoned Theme Parks
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November 27, 2021
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| S2021E137 |
Influential Inventions: Vaccines
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November 30, 2021
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| S2021E138 |
Sidewinder: The Missile that Changed Aerial Combat
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December 2, 2021
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| S2021E139 |
MV Derbyshire: The Largest British Merchant Ship Ever Lost at Sea
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December 4, 2021
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| S2021E140 |
The Places Where Planes Don't Fly
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December 7, 2021
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| S2021E141 |
M-50 Ontos: The Little Tank with 6 Cannons
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December 9, 2021
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| S2021E142 |
World War II Innovations that Changed Civilian Life
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December 11, 2021
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| S2021E143 |
Operation Squabble: When Britain's RAF Bombed the Arc de Triomphe.... With a Flag
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December 14, 2021
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| S2021E144 |
History's Most Devastating Oil Spills
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December 16, 2021
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| S2021E145 |
Engineering Luxury: The World's Thinnest Luxury Watch
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December 18, 2021
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| S2021E146 |
More Forgotten Warbirds of the Early Jet Age
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December 21, 2021
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| S2021E147 |
More Weird Historical Coincidences
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December 23, 2021
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| S2021E148 |
The Fiat G-55 Centauro: Italy's Little Known WWII Fighter
season finale
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December 30, 2021
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