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

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

This spooky statue sits outside a famous Prague theater.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

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

The colonial city's social history is reflected in its fanciful door knockers.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

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

In one Chicago park, a trio of werewolves are waiting to devour their fallen brethren.

Tiny memorials honor individual victims of the Holocaust.

A museum dedicated to a Cold War era sausage.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The most confusing clock in New York.

An artist's cute bronze subway sculptures belie his violent artistic past.

Cryptic messages embedded in the New York City sidewalk.

Despite his legacy of work in Spain, Cuba, and Florida, the larger-than-life writer's grave is a simple affair tucked in an Idaho cemetery.