Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

What better way to honor a pioneering anatomist than by preserving his severed head like a specimen?

"The prettiest love letters in the world" ... or so said Lord Byron.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Started as a kitchen garden, now the second largest botanical garden in the world.

An eerie, derelict amusement park in Berlin.

The most visited, and possibly most controversial, museum in Germany.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

The world's largest squirrel statue clutches a pecan bigger than your head.

These broken shards of ancient ruin may hide an ancient pyramid.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Resting on a hill overlooking the coast, these medieval ruins look completely deserted save for their restored chapel.

Once the hottest nightclub in France, Amnesia now lies in ruins after a 2000 bombing.

This entire town moved to a safe location after it was devastated by an earthquake, but the remains of the original town are still around.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

Not quite the menace it once was, this monster still has some chops.

A winding, blood-red tunnel of hardened lava navigable by foot.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.