Today we're exploring something that used to be top secret! Declassified secret files released by the CIA shed light on an ancient civilization. The files explain what kind of civilization it was and which catastrophic events made it vanish thousands of years ago. What could possibly go wrong?

We're also gonna learn why the Great Pyramid of Giza is a true enigma. And how could the monumental temples in Rome be built if the Romans didn’t have the technological equipment to make the stones or lift them. We'll finish our journey on Easter Island, where we're gonna reveal one more mystery...

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