This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Surreal giant face-pillars welcome visitors from across the globe to this hotel.

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.

Peace Park and the Atomic Bomb Dome.

This Japanese national treasure was originally built in 593.

Notorious artist squat renovated into legal studios.

A gathering of green robots at the Googleplex.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A young Gustave Eiffel assisted in the construction of this skinny metal observation tower.

A waterfront landing pad designated for unidentified flying objects still awaits its first guest.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

Executions were once held near this beautiful 18th-century fountain.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

Indents in the pavement are all that remain from a grisly death machine in Paris.

A popular European tradition makes its way to the states on one of America's most famous bridges.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

A tribute shrine where the Space Invasion street art movement started.

A gruesome combat between a hunter and a furious momma bear.

A haunting collection of the vanished and disappearing natural world.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

The location of this small park was once the site of an infamous public morgue.