Mount Rushmore: The Hidden Secrets

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.

The gunfight at Tombstone's OK Corral turned Wyatt Earp into an American folk hero. 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.

A long-lost treasure map claims to know the whereabouts of missing ship buried with gold and silver in the California desert, and using cutting-edge tech, a team of experts use this new evidence to get closer to a game-changing discovery.

New discoveries at the site of an alleged long-lost gold mine could lead investigators to a 200-million-dollar payday, and using cutting-edge tech, experts investigate clues in long-lost maps and relics to recover the Lost Dutchman's treasure.

New evidence suggests the Maya civilization did not suddenly vanish, but instead, that they survived and resettled in the United States; experts use cutting-edge tech to reveal what really happened to these long-lost people.

The legend of the Fountain of Youth might be explained by hidden messages encoded in a 500-year-old map, and using cutting-edge archaeological methods, experts explore forgotten caves and perilous waters to reveal this mystery's long-lost secrets.

What would happen if we got a message from space? How would we react? Scientists and sci-fi writers, with cooperation from SETI and Carl Sagan's son, Nick, unravel the impact of this world changing event, forming an intriguing hypothetical scenario

How will humans react when an alien spacecraft is on its way to Earth? Will humans learn from aliens, or become colonial subjects? Scientists and sci-fi writers, with cooperation from SETI and Carl Sagan's son, Nick, unravel the impact.

The Arrival has ended. A swarm of small spacecraft depart their huge mothership, and hover in our atmosphere. The ships open their hatches, and deposit thousands of mysterious pods on the earth’s surface. Are they a message, a gift or a weapon?

A mothership the size of Texas is hovering over Earth and we're tired of waiting. We send a rover to explore, and what we find makes us question the definition of life. On Earth, the pods multiply, making contact with them unavoidable.

Astronauts train for weightlessness and fire fighters battle forest fires.

Experts reveal how regular cars are modified to race on dangerous circuits.

The crew of a nuclear submarine reveal how they stay safe during a fire.

Massive mining machines are made to be mobile.

Investigators show how they analyze the data stored on a plane's black box.g