ust what is the ‘Mystery Flesh Pit National Park?’ An explanation of Trevor Robert’s fictional multimedia project and the massive speculative lifeform at the center of it. If an underground organism of unfathomable size were unearthed in the United States, you might expect widespread panic at the horrifying discovery — or expect the U.S. government to block off the cosmic horror from civilians. You might not expect the entity to be turned into a theme park marketed towards all ages. But that’s what happened with the (thankfully) fictional “Mystery Flesh Pit National Park,” the name given to a creature of indeterminate size and origin that was nonetheless turned into a tourist attraction. Just the sort of thing to explore at this spooky time of year.