Hamburgers are intensely proud of their tunnel beneath the river.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

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

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

An officers prison camp believed to be impregnable by the Germans saw over 30 successful escapes.

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

The prototype for all Nazi concentration camps.

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

This historic stone bridge has an entire neighborhood clinging to its sides.

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

Super-heavy Nazi architectural experiment.

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

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

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

A fascinating insight into daily life in the Eastern Bloc.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The most loyal of little dogs, or a Victorian era publicity stunt?

A slice of central Asia in the middle of Berlin.

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