A German apartment building hosting as many trees as human occupants.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

What was once thought to be a wellspring of unicorn bones is actually just a prehistoric burial site.

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

The prototype for all Nazi concentration camps.

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

Berlin's old airport.

Super-heavy Nazi architectural experiment.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

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.

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

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

This small condiment museum makes all manner of mustards with a 200-year-old mill.

In this German city center, the streets have no names.

A thought-provoking outdoor art installation sits in the seat of German law.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

This remarkable parking garage in Darmstadt has lived several lives and still contains remnants of its World War I past.

Largest illuminated advertisement sign in the world.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

A unique bridge with an equally unique view.

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

A ruined castle stands atop a hill surrounded by dragon lore.