A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

Notorious artist squat renovated into legal studios.

The last four extravagant street signs of London's historic banking street.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

These curious caverns have been home to mushrooms, gangsters, and disco.

World's largest carved onyx figure stands as a tribute to enduring peace.

Triangular House built on a leafy residential street in St. Paul.

Built in 1931, this small passageway is believed to be the first modern skyway.

Landbridge created by the South Korean version of Moses.

An eatery in a shallow river where diners can enjoy their meal mere feet from the base of an artificial waterfall.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

The legendary giant's severed hand sits on Antwerp's popular shopping street.

Antarctica's bustling metropolis, originally established by Richard E. Byrd.

Brass bricks outline the locations of Edinburgh's lost, lively market stalls.

Barça football fans might see the insignia hidden in a church window as a divine sign.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.

One of the world's largest murals covers a large swath of homes in its hillside neighborhood.

Are these prehistoric metal pipes evidence of alien plumbers? Nope, but they are amazing nonetheless.