Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

The haunting cadaver tomb of a famous French poet, playwright, and filmmaker.

A massively oversized measuring tape sculpture sits inside a hidden yard.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

The sunken structure looks like the victim of a catastrophic flood.

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

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

The first (but not only) upside-down house in Germany.

An elevator into the Baltic Sea.

An eerie, derelict amusement park in Berlin.

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.

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

The only microgravity tower in Europe can produce nine seconds of weightlessness.

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

The world's first motorway was used as a racetrack until the late 1990s.

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

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

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Berlin's old airport.

For more than 170 years, this family-run bakery has been serving Berlin’s best Baumkuchen, or “tree cake.”