Op-art architecture designed for happiness.

Baroque celebration of the end of the Great Plague of Vienna.

Giant topiary dog once played a role in a terrorist bomb plot.

An collection of Chinese propaganda posters from 1949 to 1979.

An out-of-place slice of France, smack in the middle of Shanghai.

A collection of wax anatomy by the great sculptor Clemente Susini.

Stalactites and stalagmites in a beautifully lit cave.

An Irish Memorial commemorating those who perished due to potato blight.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Dr Barnes' $25 billion private collection of art and arboretum.

Check out the underground party scene at the "Burning Man of Brooklyn."

The silly symbol for an underground protest group is now scattered around the city.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

The "Prussian Versailles" that is as glorious today as when it was built.

An eerie, derelict amusement park in Berlin.

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

Metro station with a claim to rock n' roll fame.

Berlin's old airport.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

An old department store turned Nazi prison turned artist commune.

Cold war icon and onetime "hole" in the iron curtain.

A slice of central Asia in the middle of Berlin.

The most visited, and possibly most controversial, museum in Germany.