This Swedish sculpture park is a unique combination of ancient ruins and modern art.

The rock carving that became an internet meme.

A Very Low Frequency transmitter you can tune in on your PC.

Old Danish castle immortalized in Shakespeare's Hamlet.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

These crumbling monastery ruins inspired a master of German Romanticism.

A natural wonder in south Denmark.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

Constructed by forced laborers, this submarine pen is now a museum and war memorial.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

Believed to be the first museum dedicated to the films in the world.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

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

Guests can stay at a hotel in the former French abbey where lie the tombs of King Henry II and King Richard the Lionheart.

Exquisite examples prehistoric bas-relief carvings.

This imposing castle has stood for nearly a thousand years.

This feat of German engineering is one of the only elevators in the world following a curved path.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

This giant wire frame man sculpture is crouched in contemplation.

The 20-mile causeway that separates the Netherlands from the sea.