An underground city of salt.

The world's largest secondhand book market is a haven for bibliophiles and bargain hunters.

This experimental utopian "city of the future" in rural India may hold a dark secret.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

The world's largest Tibetan refugee settlement.

The remains of what was, not so long ago, the world's largest city.

Scholar, adventurer, saint, and instigator of the Goa Inquisition.

This 17th-century mausoleum is topped with an acoustic marvel.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

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

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

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

An eerie, existential museum dedicated to the author of "The Metamorphosis."

This automated sculpture of two men peeing will spell out text messages with their micturition.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A surreal statue honoring Prague's favorite literary son.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

The first museum in the world devoted to sexual gadgetry.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

Europe's second largest ossuary wasn't discovered until 2001.