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.

Experts investigate myths of a secret portal to hell in Hierapolis.

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.

Experts travel inside ancient mounds to investigate the legend of Midas.

The Tower of London is a centuries-old castle shrouded in a grisly past.

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.

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.

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 discovery of strange giant stone heads in the Mexican jungle leads archaeologists to the lost capital city of the Olmec; new investigations reveal evidence that the secret knowledge of these mysterious people changed life in the Americas forever.

Deep in the Iraqi desert, the world's only ziggurat towers over the remains of the first civilization ever known in human history; armed with pioneering satellite imagery, experts investigate the dark mysteries behind this massive, ancient structure.

The treasures of Ramses II are found at Abu Simbel, a giant temple carved into a desert cliff over 3,000 years ago, and new discoveries at this marvel reveal the secrets of ancient Egypt's greatest pharaoh.

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.

The Pantheon is a 2,000-year-old temple with a dark secret. Today, using cutting-edge archaeological methods and brand-new evidence, experts look beneath the streets of Rome to find out why it was built and how it survived so long.

Experts explore sunken ruins and reveal one of the first great empires.

New discoveries at Pompeii's last unexplored area reveal the dark secrets of the doomsday event that destroyed it. And recently unearthed mummies might help answer Pompeii's most enduring mystery: why it was built on an active volcano.

New discoveries at a strange prehistoric site reveal the dark secrets and rituals of the mysterious people who built the world's largest stone circle, three times bigger than Stonehenge, and just as enigmatic.

Scientists use pioneering technology to discover the foundations of Venice.

A prehistoric structure could reveal mysteries to the Bronze Age.

Archaeologists use cutting-edge technology to discover what lies beneath China's Forbidden City for the first time, revealing the dark secrets of this mysterious mega-palace that have buried for nearly 600 years.

A ground-breaking experiment reveals how ancient Egyptians built the giant obelisks of Thebes and new discoveries at this holy site could explain why these mysterious marvels triggered the downfall of the pharaohs and the end of Egypt's golden age.