The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Statues of a fire-breather, a clown, and a whole performing troupe celebrate Luxembourg's creative side.

World's largest barrel containing an inn.

This tremendous timepiece was once the largest cuckoo clock in the world.

An ornate sculpture of an ox in repose marks the former entrance to Nuremberg's medieval meat market, which was destroyed during World War II.

Fantastic views and thousands of love locks.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The last bastion of Roman presence north of the Alps looms over a German town.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

A Faraday Cage protects cars from a nearby high-power transmitter.

Robots, lasers, and whoopee cushions, oh my!

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

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

A museum dedicated to a Cold War era sausage.

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

This watchtower once presided over the Berlin Wall.

Tiny memorials honor individual victims of the Holocaust.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

A former ironworks that was the first UNESCO industrial site.

This rock resembling a turned-up boot has become the symbol of St. Ingbert.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.