An abandoned NSA listening post on Berlin's "Devil's Mountain."

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

You've probably seen these distinctive orange-tiled columns on the big screen.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

Berlin's old airport.

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

These caves secretly held national treasures during World War II.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

An abstract and eyecatching clock/fountain is the centerpiece of this little-known German city.

Nestled in the hills of Crete, a local artist has created a wonderland of stone and terracotta sculptures.

This famous archeological mystery may be an ancient example of movable type.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

This abandoned Greek island was the last active leper colony in Europe.

Constantly maintained, this organ is playing a six-century long composition by John Cage.

This enchanting mountain plateau celebrates spooky local folklore.

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

Where the interconnection of German power grids should be.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

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

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

This 17th-century "unicorn" was cobbled together from the skull of a rhinoceros, the legs of a mammoth, and the horn of a narwhal.