The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

This German art chapel is perfect for those who like their worship hard, modern, and utterly alien.

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

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

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

The last bastion of Roman presence north of the Alps looms over a German town.

Twisted buildings adorn the banks of the Rhine river.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

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

This former steel and coal plant is now a neon-lit industrial fantasia.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

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

No need to strap in for a "ride" on this walkable roller coaster.

This "floating railway" is one of the world's oldest monorail systems.

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

Model Trains and Much More in Hamburg.

Over 12,000 hygiene oriented objects and exhibits.

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

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

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

The "Prussian Versailles" that is as glorious today as when it was built.

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

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

Metro station with a claim to rock n' roll fame.