A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A giant silver apple a day keeps the perils of capitalism away.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

An atmospheric, medieval-themed book store hides in a 13th-century underground space.

A unique zoological park home to over 30 species of wild cats, both big and small.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

The history of radiation is on safe display at the foot of a radiation science laboratory.

The oldest statue in the Netherlands has survived relocation, bombardment, and burial.

Semi-mystical manmade towers of rocks decorate this rocky seaside.

A solitary lighthouse in Spain was an inspiration to the great Jules Verne.

The abandoned club hides in the hills of Ibiza.

Originally slated to become a luxurious resort, this structure is now a graffiti haunt reclaimed by nature.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Portraits of musicians line Oude Binnenweg, the jazziest street in the city.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

The world's first floating farm is staffed by one human, three robots, and 35 cows.

The European equivalent of the Hollywood Walk of Fame is slowly spreading over the entire city.

The attic of a four-century-old canal house hides a clandestine church.

Houses are tucked between, on, and underneath giant boulders.