Host Don Wildman explores underground Sydney, including a 19th-century prison, caves that were once home to fugitive outlaws, and gold mines. Also, a secret World War II storage place for chemical weapons is toured by those who once worked there.

A history marked by conquest and conflict leaves a rich mythology of gods and men beneath the soil of Turkey. Host Don Wildman focuses on the remnants from invasions and travelers on the trade routes plus investigating the truth behind legends of the Trojan War.

Host Don Wildman explores ancient structures buried beneath the desert sands of Egypt and the streets of Cairo, examines how these engineering marvels survived invasions, and discovers a tomb filled with 2,000-year-old mummies. Also examined: the Book of the Dead and a step pyramid built a century before the Giza pyramids.

Host Don Wildman explores underground San Francisco, including an ammunition depot, a former repository for nuclear missiles, Civil War fortifications beneath Alcatraz, and tunnels below Chinatown.

Christianity evolves in unique ways in Ethiopia's ancient underground engineering marvels and remote, cliffhanging caves; emperors tombs; subterranean cathedrals; the Queen of Sheba's buried palace; possible site of the Ark of the Covenant.

Host Don Wildman explores ancient Rome, focusing on places associated with gladiators, including the Colosseum, brothels, and crypts. Also: a school where gladiators learned how to fight and survive.

Host Don Wildman explores underground Los Angeles, including a haven for killer Charles Manson and his followers, tunnels where corrupt cops secretly ran the city, a dormant subway system, coastal military bunkers, and city war rooms ready for the next big quake.

Explore life beneath the streets in Europe after the fall of the Roman Empire. Host Don Wildman tracks down subterranean secrets from Europe's Dark Ages, including a secret society's immense quarries, Templar torture chambers, and the tunnels of medieval "ghost knights."

Don Wildman travels to Belgium where he explores the subterranean web of World War 1 trenches and bunkers.

Host Don Wildman explores underground Las Vegas, including secret surveillance centers for casinos, underground vaults, and tunnels used during the Prohibition era.

Host Don Wildman travels to Sicily to trace the Mafia's roots back to a secret vigilante society in an underground network that was created to put corrupt city officials on trial and execute the guilty. Included: the escape route of a mob boss; a bone crypt; and bunkers used during World War II by the Axis powers.

Host Don Wildman discovers what it was like to live through World War II's Battle of Okinawa by exploring the Japanese defenders' tunnels, caves, and bunkers. He dives to the USS Emmons, a destroyer sunk off Okinawa's coast.

In the third-season opener, Don Wildman explores London, England, above and below ground to uncover its violent crimes, extreme poverty, and lawlessness during the chaotic Victorian period.