E4 • Mount Rushmore: Hidden Secrets

E1 • Egypt's Buried City

Experts investigate a lost city buried in the Sahara.

44m • 2020

Experts investigate a lost city buried in the Sahara.

E2 • Vesuvius's Secret Victim

When Pompeii was destroyed, Herculaneum was destroyed, too.

44m • 2020

When Pompeii was destroyed, Herculaneum was destroyed, too.

E3 • Lost City of Troy

Troy is the legendary lost city, but its existence was never confirmed.

44m • 2020

Troy is the legendary lost city, but its existence was never confirmed.

E4 • Mount Rushmore: Hidden Secrets

Mount Rushmore is one of North America's most iconic landmarks. Experts use cutting-edge technology to reveal what lies beneath the rock.

44m • 2020

Mount Rushmore is one of North America's most iconic landmarks. Experts use cutting-edge technology to reveal what lies beneath the rock.

E5 • Tower of Babel: New Evidence

The Tower of Babel is one of the most famous stories of the Bible. Archaeologists use new technology to uncover how engineers could have built it.

44m • 2020

The Tower of Babel is one of the most famous stories of the Bible. Archaeologists use new technology to uncover how engineers could have built it.

E6 • Hitler's Lost Bunker

Experts uncover new evidence of the underground bunker of Adolf Hitler.

44m • 2020

Experts uncover new evidence of the underground bunker of Adolf Hitler.

E7 • Tower of Pisa: The New Mystery

The Leaning Tower of Pisa is one of the world's most iconic buildings, but why does it lean? Investigators uncover the reasons for its tilt.

44m • 2020

The Leaning Tower of Pisa is one of the world's most iconic buildings, but why does it lean? Investigators uncover the reasons for its tilt.

E8 • Ghosts of the Wild West

Experts investigate the infamous gunfight at the O.K. Corral.

44m • 2020

Experts investigate the infamous gunfight at the O.K. Corral.

E9 • Hunt for the First Pyramid

Saqqara is the site of the first pyramid -- the Step Pyramid of Djoser.

44m • 2020

Saqqara is the site of the first pyramid -- the Step Pyramid of Djoser.

E10 • Alcatraz's Hidden Secrets

Alcatraz is one of the most famous prisons in the world. Experts investigate its remarkable engineering secrets and why it was so hard to escape from.

44m • 2020

Alcatraz is one of the most famous prisons in the world. Experts investigate its remarkable engineering secrets and why it was so hard to escape from.

E11 • Rome's Great Wall

Who were the Romans trying to keep out with Hadrian's Wall?

44m • 2020

Who were the Romans trying to keep out with Hadrian's Wall?

E12 • Lost Kingdom of Kush

Why are the Pyramids in the deserts of Sudan there and who built them?

44m • 2020

Why are the Pyramids in the deserts of Sudan there and who built them?