This lakeside bunker complex in Mamerki, Poland, housed the Supreme Military Command of Nazi Germany during World War II.

Perhaps the only one of its kind, the nearly-forgotten site once held mortal (and rigged) gladiatorial games between tigers and imperial war elephants.

How a bat poo mine became a major Native American archaeological site—and connections to legendary red-haired giants.

A cenote filled with Colonial era artifacts whose waters cannot be accessed.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

Unique collection containing a wide and curious range of contraceptive items.

A collection of anti-communist sculptures stands watch in the Mojave Desert.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

Mosques carved from coral and dozens of well-preserved stone structures fill this 500-year-old Swahili trading center.

A converted hangar displays dozens of helicopters, from a famous 1943 rescue chopper to several autogyros.

This museum started by a curious collector is now a place for believers and skeptics alike.

Abandoned station along an ancient pilgrimage route.

These hilltop ruins of a forgotten Buddhist monastery flourished in Antiquity from trade with the Roman Empire.

This coastal port saw one of the most significant battles of the Civil War.

See four top-secret US spy aircraft of the Cold War era, including the legendary SR-71 Blackbird and the A-12 Oxcart.

A giant chameleon, with a fascinating purpose.

Under Hanoi’s medieval citadel sits a secret military headquarters from the final years of the Vietnam War.

The helicopter that "Tricky Dick" absconded from the White House in on his last day in office.

This historic castle is one of the oldest and most impressive in all of Japan.

Located within a temple complex, this museum has a fantastic collection of around 500 idols of Lord Ganesh.

A former palace that showcases weapons, jewelry, clothing, furniture, musical instruments, and more from the Peshwa Era.

A stoic rock cairn is all that remains to remember one of the more brutal instances of frontier treachery in American history.

This 17th-century Portuguese fort now houses a nautical museum.

This beautifully preserved Ottoman house is steeped in history.