The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

One part local history, 99 parts gruesome haunted house.

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

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Ancient mysterious ruts carved in the bedrock.

Museum preserving torture methods from the past.

A Nesting Doll of Churches.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

World's strongest whirlpool.

According to the locals, the sands of this secluded Norway beach are infused with gemstone particles.

A wonderfully strange collection of 500+ stuffed frogs doing people things.