The Inca capital of Cusco was said to be the site of untold gold and riches, and new discoveries at this mysterious site reveal the secrets behind this mighty empire's fall.

Deep in the jungle, the lost city of Tikal holds the dark secrets of the Maya, and now, a new investigation uncovers how it grew into a megacity home to 100,000 people, and why it was mysteriously abandoned.

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.

The Nazca Lines are mysterious, alien-looking symbols carved into a remote desert more than a thousand years ago. New discoveries might finally reveal what these strange images mean and if they explain the disappearance of the people who made them.

The Empire State Building is one of the wonders of the modern world, and cutting-edge tech helps experts explore it like never before, revealing the secrets of its construction and the mysteries hidden deep in its foundation.

The Lighthouse of Alexandria is one of the world's original Seven Wonders, but it could have been home to a mysterious superweapon, and using cutting-edge tech, experts investigate the secrets of this fabled death ray and its long-lost home.

A mysterious castle was once a fairytale estate, but today, the building is said to be haunted, and experts investigate the secrets of this eerie fortress and the ghostly stories inside.

At an infamous prison in the Amazon, the most dangerous criminals on earth faced hard labor, a hostile environment, and death by guillotine; today, it's deserted, and new discoveries reveal why this compound was built and why it was abandoned.

An abandoned town in the Nevada desert are the ruins of an American Atlantis, destroyed by catastrophic floods when the Hoover Dam was built; today, experts investigate the secrets of this ghost town as water levels recede and the city reemerges.

Sparks fly as a group of expert bot builders fight head-to-head to become BattleBots champions.

A supersized Fight Night rolls on as robots collide in five deadly smackdowns, concluding in a world class fight between two heavyweights.

Expert robot builders continue their quest to become BattleBots champions, and two legends go head-to-head in an epic showdown.

As the battles continue, a legendary bot takes on the reigning champion in an epic, supersized face-off.

A supersized Fight Night pits two fan favorites against each other in a ferocious heavyweight bout.

Two world-class robots face-off as elite robots compete for the 2018 BattleBots championship.

A first-time fighter looks to unseat a former BattleBots champ in a match to the death.