This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

20-foot tall lamp mumbles Swedish to celebrate the holidays.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

Macabre astrological automaton clock dating to the late 1400s.

One man's desire to transcend art led to the construction of this outsider chapel.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

A Gothic cathedral created from volcanic rocks.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Copenhagen's celebrated theme park and gardens.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

Amsterdam's Red Light District leaves little to the imagination.

A beautifully eclectic mix of architectural styles.