A park ranger camping in a remote part of the Grand Canyon awakes to voices and claims to have seen people dressed in 1950's era clothing being led by Native Americans to an area called the Confluence. Some believe the figures are from the first major airline crash in US history, and this episode revolves mainly around the scientists attempting to explain this phenomenon.
A plane crash in Everglades National Park leads to strange hauntings on other aircraft, and two serial killers are inexplicably drawn to the murky swamps of Everglades.
Hawaii's Volcanoes National Park is the site of strange curses, black magic, and mysterious deaths which some believe may all be linked to the Hawaiian Goddess of the Volcano, Pele.
UFO sightings at Joshua Tree National Park lead to the invention of the anti-aging machine, links to a powerful creature called Yucca Man, and to theories of alien-human genetic experiments that could enslave the human race.
Montana's Glacier National Park may hide a secret underground Nazi base, where Nazi scientists built advanced flying technology, and may even be the final hideout for Adolf Hitler himself.
Inexplicable disappearances and stories of mysterious DNA experiments may be explained by ancient Karuk Indian legend of powerful spirits at the summit of California's Mount Shasta National Park.
El Yunque National Park harbors a powerful creature called the Chupacabra that is linked to UFO sightings in the area, leading to theories of a US government facility conducting secret experiments.
Visitors to Pennsylvania's Gettysburg National Park report numerous sightings of ghosts, which appear to be soldiers from one of the bloodiest battles in US history. Long before the Civil War researchers discover the area's bloody history from Native American battles. This leads to speculation that there is something about Gettysburg that has created a hotbed for ghostly activity.
Big Bend National Park has been a hot spot of unexplained UFO activity for centuries such as the mysteries of The Zone Of Silence, the alien Nordic encounters, and evidence of alien mining.