A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

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

A surreal statue honoring Prague's favorite literary son.

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

This strange statue features a bust of the famous composer plopped atop a woman's body.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Macabre astrological automaton clock dating to the late 1400s.

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

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

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

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

The Habsburgs' royal collections of art and wonders.

Op-art architecture designed for happiness.

This belfry is all that remains of the town that was buried by a violent volcano eruption.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

These bronze sculptures sow whimsy by hamming it up on a pedestrian mall.

One of the biggest markets in Asia, under one of the continent's largest domes.

Originally a meeting place for foreign correspondents and war reporters, the FCC remains an atmospheric spot for sunset drinks in Phnom Penh.

Melbourne's favorite bronze dog.

Bronze statues honor the brave explorers who passed through this Antarctic gateway.