The Seven Wonders are the engineering marvels built by great minds of long-lost civilizations, but we're not sure if some even existed. New discoveries & cutting-edge archaeological methods might prove what they looked like and why they disappeared.

When Pompeii was destroyed by an apocalyptic volcano in 79 AD, another Roman town was destroyed, too; experts use cutting-edge tech to investigate the secrets of Vesuvius's second victim, which is one of the most perfectly preserved Roman towns on earth.

The Leaning Tower of Pisa is one of the world's most iconic buildings, and it's also the site of an 800-year-old mystery; using cutting-edge tech, experts investigate the archaeological evidence to reveal when it might finally fall over.

A strange site called Saqqara is home to Egypt's very first pyramid. Here, experts use cutting-edge tech to reveal why the ancient Egyptians started building pyramids and if the mummified animals found here are evidence of a bizarre religious cult.

The Roman Empire built Hadrian's Wall to guard its frontiers at the edge of the world; new discoveries reveal who the Romans were trying to keep out with this 72-mile-long megastructure and what it tells us about the ancient people of Iron Age Britain.

Pyramids in the deserts of Sudan are the ruins of a powerful lost civilization that rivaled the pharaohs of ancient Egypt. Using cutting-edge tech and archaeological methods, experts are revealing the secrets behind the mysterious Kingdom of Kush.

There's a lost city buried in the Sahara. Evidence reveals it's home to Nefertiti, Tutankhamun, and the forbidden god of an outlawed religion; experts use cutting-edge tech to uncover the secret doomsday that caused this strange place to disappear.

The Tower of Babel is one of the most famous stories of the Bible, and to find out if it really existed, archaeologists use cutting-edge tech and the latest science to investigate how ancient engineers could have built such an extraordinary megastructure.

Alcatraz is home to secrets that only cutting-edge archaeology can reveal, and using the latest science and the newest tech, experts search for hidden evidence to investigate why so many tried and failed to escape America's toughest jail.

The gunfight at Tombstone's OK Corral turned Wyatt Earp into an American folk hero, and to find what really happened here, experts use the newest tech to discover what caused the fatal shootout and what it reveals about the dark secrets of the Wild West.

Mount Rushmore is one of America's most iconic landmarks, but there are dark mysteries behind its presidential faces; experts use cutting-edge tech and the latest science to reveal what lies beneath the rock and the secret history of its creation.

Troy is the legendary lost city at the center of the Trojan War but its existence has never been confirmed; new discoveries and cutting-edge science might prove if this place existed and if the Greeks really conquered it with the infamous Trojan Horse.

The long-lost underground bunker of Adolf Hitler is home to some of the greatest secrets of the Nazi regime, and now, experts use cutting-edge tech to discover new evidence of Hitler's evil vision for global domination.