The latest science reveals the last secrets of some of history's greatest rulers. This episode is a mashup of S03E07, "Wrath of Attila the Hun" and S02E01, "Tut's Buried Secrets."

New discoveries reveal the dark secrets behind the treasures of the most alien and mysterious placed on the planet. This episode is a mashup of S03E06, "Lost World of Easter Island" and S02E03, "Lost Temples of the Jungle."

New technology reveals mysterious secrets buried in ancient Greece. This episode is a mashup of S03E05, "Hunt for the Real Atlantis" and S01E04, "Summit of the Gods."

New evidence gives rise to speculation over whether Attila the Hun, one of history's fiercest warriors, played a role in the downfall of the Roman Empire by waging a campaign of terror. This investigation centers on Trier in Germany.

New findings reveal the secrets behind some of the world's most iconic monuments. This episode is a mashup of S03E04, "Statue Of Liberty: The New Secrets" and S02E04, "Secret History of the Sphinx."

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.

New discoveries reveal the dark secrets of ancient Egypt's holiest and most mysterious cities, where the pharaohs practiced strange rituals that might have helped their rise to power. This episode is a mashup of S03E03, "Forbidden City of the Pharaohs" and S02E09 "Mystery of Egypt's Mega Temple."

Knossos, a mysterious ruined Minoan city on the island of Crete (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.

New discoveries reveal evidence of human sacrifice at mysterious ancient American pyramids. This episode is a mashup of S03E02 "Lost Pyramids of the Americas" and S02E02 "Curse of the Blood Pyramids."

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.

New treasures reveal the dark secrets of history's deadliest warriors. This episode is a mashup of S03E01 "Viking City of the Dead" and S02E06 "Hunt for King Arthur's Castle."

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.

At Caral, an ancient city in Peru 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.

When Trelleborg, a mysterious Viking fortress lost underground for over a thousand years, is discovered in Denmark, archaeologists investigate its buried treasures to reveal why it was built and what caused the end of this fearsome civilization.