Over 10,000 years ago, the city of Atlantis was believed to exist as a pinnacle of human achievement before it was suddenly, mysteriously wiped from the face of the earth. Over millennia of human evolution, our species has returned time and time again to the mystery of the Lost City. This episode originally aired in May 2019.

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Known as the first Empire, this great city ran afoul of the gods and was destroyed over 10,000 years ago. Despite expeditions made by everyone from Spanish Conquistadors to Nazis, there’s no proof the Atlantis actually ever existed. This episode originally aired in May 2019.

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When a group of thieves hijacked a train and escaped with millions of pounds, they set a new record for the largest cash robbery in British history. But who tipped them off? For decades, sleuths have debated the identity of ‘The Ulsterman’ — the shadowy insider who instigated the Great Train Robbery of 1963. 

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The site of the bloodiest battle ever fought on American soil is also allegedly home to countless restless spirits. Today, we’ll cover the nightmarish clash between the Union and the Confederacy and retell some of the most famous — and terrifying — ghost stories from its grounds.

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In the 1940s, an elite group of American female pilots known as the WASPs risked their lives during WWII, testing new airplane models, transporting aircraft, and preparing fighter planes for combat. In October 1944, Gertrude Tompkins Silver took off from Los Angeles in a P-51 Mustang. It was supposed to be a routine flight, but four days after takeoff, Gertrude was declared missing.

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Some of the wildest UFO encounters have happened in the Alaska Triangle. Are aliens behind the many unsolved disappearances there? Or should we believe the stories that say cryptids—like the Hairyman—are stalking the region?

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Missing planes, government cover-ups, something called the Dark Pyramid… The mysteries run deep in this remote region of Alaska, which has been earning an unnerving—and some say, supernatural—reputation since the 1950s.

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Aliens did not build Machu Picchu (though this episode does include a story about supernatural warriors…). Ever since Hiram Bingham III came upon “the city in the sky” in 1911, questions have lingered: Who lived there? What was its purpose? And how did it survive all this time intact? Scientists and scholars continue to puzzle out the answers.

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In the early 20th century, a history professor from Yale introduced the world to Machu Picchu—an ancient Incan city built atop the Andes Mountains. The now-legendary site is a feat of engineering, hydrology, and physics. It’s also a place of mystery, posing questions that have baffled scholars for years. 

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In rural Missouri, a reverend’s granddaughter hunts for proof of a family secret….and stumbles into a government conspiracy.

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