Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

One of the largest Roman settlements in Portugal.

Ancient burial grounds of the wealthy.

A nightly tradition fills the streets of Flogsta with a collective scream.

The second oldest anatomical theater is housed in a museum of curiosities.

It houses the remains of a 17th-century version of the Titanic.

Cold war icon and onetime "hole" in the iron curtain.

Where once there was a train station bathroom, there is now this German burger joint.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The abandoned remains of this Victorian brewery hide crumbling bowling alleys and rusting industrial gear.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Blitzkrieg bop your way through Berlin's Ramones Museum.

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

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A slice of central Asia in the middle of Berlin.

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

France's most famous cemetery, with some of its most curious tombs.

A battle between nature and architecture in the Cambodian jungle.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

The world's largest wooden structure.