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

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

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Berlin's old airport.

These 18th century gardens tell a rocky story of the son of Odysseus.

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

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

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

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

This unique Renaissance castle was turned into a home for Nazi occultism.

Blitzkrieg bop your way through Berlin's Ramones Museum.

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

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A stairway to heaven, or to nowhere at all.

"The most colorful grottoes of the world.

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

An intricate and amazing house built by architect Karl Junker.

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

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

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

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Reminders of the Battle of Berlin still scar the railway.

An eerie, derelict amusement park in Berlin.