The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

This abandoned Greek island was the last active leper colony in Europe.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

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

A towering monument to war, located on a beautifully peaceful hill.

Tiny memorials honor individual victims of the Holocaust.

The final resting place of many of Germany's most famous communists.

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

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

Berlin's old airport.

A 12th-century fortress containing some of Berlin's oldest buildings.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

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

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

Art and a pun, all in one.

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

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.

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

A slice of central Asia in the middle of Berlin.

An eerie, derelict amusement park in Berlin.