Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

A crumbling World War I fort that is reached through a series of concrete tunnels.

According to legend a man pooped out the window of this tower to prove that it was straight.

This famed marionette theater and museum is bursting with imaginative string puppets.

In this truly magical place, rent hasn't been raised since the year 1520.

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

The United Arab Emirates's biggest and oldest fort pays homage to a lost era.

This fountain tucked away in a park is the focal point of the only "Green Basilica" in Germany.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

This fountain was once heralded as the largest in the world.

Europe’s most powerful hot spring supplies the surrounding region with hot water.

What appears to be an ordinary bridge is actually a rare aqueduct.

An abandoned Jewish sanatorium is tucked within the woods of Poland.

The world's first jet-powered aircraft were assembled by the Germans in this secret factory in the forest during WWII.

Hidden in the forest are the crumbling, graffiti-covered remains of the factory where most of Germany's explosives were produced during World War II.

Originally slated to become a luxurious resort, this structure is now a graffiti haunt reclaimed by nature.

Ancient serpentine sacrifice holder that has stood the test of time.

Legend says this sculpture commemorates a brave baker who rescued the city in the Thirty Years' War.

Deep in the forest next to Augsburg are abandoned bunkers and bullet traps from the region's military past.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.