The "dragon babies" of southeastern Europe.

Op-art architecture designed for happiness.

Macabre museum devoted to historical Viennese murders.

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

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

A giant interactive periodic table with real samples of the elements.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

Looming communist pillar with a Czech twist.

Walk through Czech history in Prague's largest graveyard.

A bus with a butt and biceps to put Olympic athletes to shame.

A church of bones, decorated with 40,000 human skeletons.

A massive, abstract lookout tower providing a panoramic view of Prague.

The enigmatic skull gazes out over the ruins of a once-great Mayan city.

The remains of an Aztec school and various intriguing artifacts lie below a modern cultural center.

The ruins of a former sanctuary for elite Aztec warriors.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

A statue in Balderas subway station honors the rock star who wrote about it in a song.

The former Mexican president kept the bullets that killed his predecessor on display in his home, now a museum.

A gigantic, symbolic artwork covers the side of the building.

History is on display in this hall, which has served as the seat of city government for centuries.

Its incredible collections are dedicated to preserving Mexico's film history.

This architectural wonder of Mexico City houses several art schools and national research centers.