Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

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

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

During World War II, the Nazis repurposed this beer cellar to store stolen artwork.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

An industrial relic is now one of Europe's most staggering art spaces.

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

Retirement home for giant obsolete machines.

Deep in the Thar desert, a temple crawling with thousands of holy rats.

This pre-Hispanic apartment complex also includes ancestral paintings that point to its military past.

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Elevated freight railway turned wildly successful urban park.

The home of the first American-born saint is one of the only curved buildings in New York.

Try not to get slimed in Tribeca.