Cryptic messages embedded in the New York City sidewalk.

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

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

Tiny memorials honor individual victims of the Holocaust.

One of downtown Berlin's last reminders of its Communist past.

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

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.

Where once there was a train station bathroom, there is now this German burger joint.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

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

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

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

100 massive sculptures in the Hudson River Valley.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

A hotel and restaurant serving as the mecca of kitsch.

Steam out your ears for New Year's Eve.

New York City's only preserved family home from the 19th century.

A celebration of capitalism in Midtown.