Squeezing inside this deep, narrow canyon reveals a festival of desert colors.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

The largest fountain in Bratislava.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A museum glorifying the life of Stalin, located in the city of his birth.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

Ancient rock-hewn town that witnessed key events of Georgian history.

Underground monastery and fortress.

God's Saharan sandbox of wrath.

Traditional 11th-century outdoor tannery.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

The other side is actually green.

A fortified city, home to a remaining population of five families

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

Mosaics, storks, and brothels—this ancient city has it all.

One of the most spectacular canyons in the world.

A mocking tribute to the past and modern leadership of Prague.

Monument to a suicide protesting the Soviet invasion.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

This artificial cave looks like something out of a fairytale.

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