A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

This massive library holds what was once the largest book collection in the world.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

What looks like a normal building is really a hollow facade hiding a subway vent.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This curious sculpture represents the perseverance needed to take to the skies.

Reminders of the Battle of Berlin still scar the railway.

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

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

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

A brush maker used his factory to protect blind Jews from the Gestapo.

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

A monument to the man who almost killed Hitler.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Tiny memorials honor individual victims of the Holocaust.

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

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.