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VOICE OVER: Rebecca Brayton WRITTEN BY: Arianna Wechter From phantom ships to vanished civilizations, history is filled with puzzling enigmas that have finally been solved! Join us as we count down our picks for the greatest historical mysteries that once baffled experts but have now been explained. Our countdown includes the truth about Anastasia, what really happened at Tunguska, how the pyramids were built, and more! We'll explore how Roman concrete has lasted millennia, why the Nazca civilization collapsed, what the "Face on Mars" really is, and how science debunked the Flying Dutchman legend. Which historical mystery revelation surprised you the most? Let us know in the comments below! read more...