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

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

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A dilapidated dock tells the story of Titanic's missed arrival.

The former hotel where Tesla invented the radio.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

New York City's smallest piece of private property.

This semi-hidden Manhattan restaurant is based out of a loading dock.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Commemorating the spot where the famous scientist fed his pigeons.

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

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

Gargantuan home of Russian science.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

Stalinist skyscraper built with help of cryotechnology.

The tallest hotel in Europe.

Former headquarters of the KGB.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The Nazis lost more men trying to take this Russian-held Stalingrad apartment block than they did when taking Paris.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.