What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

Budapest's Communist-era statues, banished to the suburbs.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

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

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

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

A restaurant and observation deck built in a unique broadcasting antenna.

Berlin's old airport.

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

When the rain falls, this drain system turns into a musical instrument.

A fascinating insight into daily life in the Eastern Bloc.

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

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

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

An eerie, derelict amusement park in Berlin.

The fairy tale castle of the "fairy-tale king."

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The oldest working mechanical clock in the world.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

High winds can make this one scary landing.

The platform atop this verdant volcano was built with the help of a royal elephant.