This massive library holds what was once the largest book collection in the world.

Notorious artist squat renovated into legal studios.

The final resting place to 300 Victorian-era pets hides inside the city park.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A kaleidoscopic warehouse-maze of handmade neon signs.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A 12th-century fortress containing some of Berlin's oldest buildings.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

A slice of central Asia in the middle of Berlin.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

The "Seinfeld" diner.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A legendary speakeasy bookstore returns from the brink.

Ride the subways of yesteryear.

One of only two commuter aerial tramways in the United States.

Read a book next to a Midtown waterfall.

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

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

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

An Argentinian businessman facing terminal cancer built this whimsical medieval village using salvaged materials.

A vibrant street away from the typical tourist track, lined with colorful, mosaic-covered houses.