A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

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

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

Started as a kitchen garden, now the second largest botanical garden in the world.

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

This German monument honors the so-called "Prince of Mathematicians."

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

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

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

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

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

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

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

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.

This German museum devoted to the simple wonders of salt is actually built over an old saltworks.

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

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

A Nazi concentration camp and Anne Frank's place of death.

A strange rock formation with numerous legends trying to explain it.

Goethe's "Faust" was inspired by these rock formations known as the "Devil's Pulpit" and "Witches' Altar."

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.