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

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

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

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

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

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

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

A small but immensely extravagant palace built by the "Night King."

Super-heavy Nazi architectural experiment.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

The patron saint of spinsters grasps a container of dried blood.

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

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

"The most colorful grottoes of the world.

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

An intricate and amazing house built by architect Karl Junker.

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

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

A striking 12th-century-style castle built on the edge of a cliff.

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.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.