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

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

A surreal statue honoring Prague's favorite literary son.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A Jenga-style cylindrical tower of books that appears to go on forever.

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

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

Apartment complexes built into huge repurposed natural gas tanks.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

The topiary maze at the Habsburg hunting lodge.

These relics of the city's past now exist as a prominent modern feature.

Baroque celebration of the end of the Great Plague of Vienna.

A set of outdoor stairs named in honor of a famous Austrian artist.

Dine amidst exotic plants at this former royal greenhouse.

Designed as a reminder of one of the darkest moments in Austrian history.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

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

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

A silly medieval mural preserved on the side of a Viennese house.

A spherical "micro-nation" in the heart of Vienna.

Op-art architecture designed for happiness.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

No one knows the origin of this creepy little stone man with an oversized phallus.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.