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

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

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

This monumental work of art symbolizes the coming together of a previously divided city.

The first recognized Neanderthal remains were found in this now-lost cave in 1856.

Largest illuminated advertisement sign in the world.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A plaque on the side of a building is a small tribute to the woman who invented an iconic Berlin fast food.

Dine at a legendary after-hours joint frequented by David Bowie and Iggy Pop.

The most visited, and possibly most controversial, museum in Germany.

One of downtown Berlin's last reminders of its Communist past.

Where once there was a train station bathroom, there is now this German burger joint.

A tree planted by Marie Curie is treasured by the Radium institute that she set up.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

Look closely and you’ll notice that the color changes a third of the way up the tower.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

Trek up this glacier before it disappears.

Admire dozens of life-size animals made from old scrap metal, nuts, screws, and valves.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Once overlooking the town, this church now resides on a permanent tilt.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.