This wooden hotel is a temple to German sustainability and forest conservation.

A century-old shot ball factory tower is open to the public once a year.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

It's good luck to be mocked by this monkey.

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

Hamburgers are intensely proud of their tunnel beneath the river.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

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

Berlin's old airport.

A fascinating insight into daily life in the Eastern Bloc.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

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

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

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

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

An eerie, derelict amusement park in Berlin.

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

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

This overlooked street light once served as a KGB dead letter box.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

You will not be able to miss this building.

Black cat statues guard this temple-like Egyptian revival factory.