The mysterious statues of Easter Island, the Moai, were built by one of the world's strangest and most isolated civilizations, the Rapa Nui. Today, new evidence reveals why they were built and what caused Easter Island's sudden downfall.

At an ancient city lost in the desert for 5,000 years, experts uncover evidence of human sacrifice and strange rituals, and new discoveries reveal that the people who lived here might have been the first civilization of the Americas.

A mysterious city in ancient Egypt, Thebes, is the home of the Valley of the Kings, Luxor, Karnak, and other grand temples, and new discoveries reveal how they were built and if the god the pharaohs worshiped here helped them rise to power.

The Statue of Liberty is the home to dark American mysteries, and today, experts are using the latest science and technology to reveal her secrets and discover the inspiration for this modern marvel.

Attila the Hun was one of history's fiercest warriors, and new evidence reveals if his terror was responsible for the fall of Roman Empire.

When a mysterious Viking fortress lost underground for over a thousand years is discovered, experts investigate its buried treasures to reveal what caused the end of this fearsome civilization.

A mysterious ruined city in Greece is the home of the mythical Labyrinth and the Minotaur, and its catastrophic downfall might have inspired the legend of Atlantis. New discoveries at this site reveal a truth stranger than fiction.