Five hundred years before Columbus arrived, a metropolis flourished in North America. It was bigger than Paris and London and featured a towering pyramid that still stands today. What happened to this ancient mega-city and why has it remained one of Western archaeology's best-kept secrets? Using modern technology, we explore this lost empire and reveal its shocking past that marked the dramatic rise and fall of America's first great city.

In a cave by the Dead Sea, a copper scroll treasure map from the time of Jesus was found, promising riches estimated to be worth billions by today's standards. Over half a century later, mystery still surrounds this ancient manuscript. Could these fragments of corroded metal really hold the clues to a massive buried fortune? If so, where did these vast treasures come from? Why were they buried? And are they still out there? Join the investigation as we reveal the secrets behind this very unique and valuable Dead Sea Scroll.

The quest for the Holy Grail has consumed knights and crusaders, and has inspired legendary tales and Hollywood blockbusters. Could it be that the epic search is finally over? One church in Spain says they have found the sacred chalice, and that they have evidence to prove it, but some experts believe this is just the latest in a long line of false claims. Our team traces the extraordinary story behind this ultimate relic and uses forensic and historic analysis in an attempt to solve this 2,000-year mystery.

Ramesses II was the most powerful pharaoh ever to rule Egypt, and his capital city, Pi-Ramesses, was his crowning achievement. It was the biggest building program since the pyramids, but somehow, this metropolis completely vanished from history. What happened? Where did it go? And where was it built to begin with? Join us on the hunt for the lost city of Ramesses the Great, a story of dramatic ruins that misled archaeologists for decades and the brilliant detective work that finally uncovered the fate of this magnificent city.

Since its discovery nearly a century ago, archaeologists have been trying to unlock the secrets of King Tut's tomb, but many questions remain. Why does the tomb appear to be so hastily built? Why is there a strange, black mold peppering the walls? And most intriguingly, does the tomb also house the mummy of ancient Egypt's most iconic queen, Nefertiti? Travel with us to the Valley of the Kings, where Howard Carter made his spectacular discovery in 1922, as we use the latest in digital technology to solve these puzzling mysteries.

Around 360 B.C., the Greek philosopher Plato recorded the legend of Atlantis, the great civilization swallowed by the sea. For centuries, adventurers and archaeologists have searched in vain for the lost city. But now, an international team of experts has uncovered evidence of an epic catastrophe that wiped out a technically advanced and wealthy Mediterranean civilization 3,500 years ago. Join us as we detail a devastating natural disaster and the cataclysmic events that changed history and inspired a myth.