During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

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

A magical place that lets you play in and explore the world of Studio Ghibli.

A psychedelic labyrinth on the San Francisco bay.

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

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

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

Countless grotesque faces stare out from this eerie Prague art wall.

Two stunning 17th-century libraries and a cabinet of curiosities.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.