These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

The bones of an old zoo crumbling in the shadow of a new one.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

A wacky two-story folk-art assemblage of carved and found objects, with lights, motion, and sound now in need of financial support.

To find the "unicorns of the deep" you've got to go downstairs.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

This army of concretions is an unexplained geological phenomenon unlike anything else in the world.

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

A small town hallucinates en masse - Bad bread, or CIA science project?

Grottoes, sculptures, and recycled ceramics permeate what was once just a small farm in France.

France's highest manned weather station is the only one still inhabited by meteorologists.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's high-tech, future-themed amusement park.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A beautiful but toxic fountain of mercury.

The television series' iconic giant foot was borrowed from this classical painting.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.