Somber memorial to the May 10, 1933, book-burning which took place on this spot.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

Revitalization efforts converted a former U.S. military heliport into a sprawling urban park.

World's only telecommunication tower with a wooden pinnacle.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

A famed artist's inspiring work of peace and tolerance.

Perhaps the most spectacular grotto along the Algarve coastline.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

This strange statue features a bust of the famous composer plopped atop a woman's body.

This small chapel built into rock is the oldest place of worship in Luxembourg.

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

An ancient Roman relief beautifully preserved on the façade of a house.

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This beautiful spit of land was once the summer playground of the king of Spain.

Marvel at this immense work of art that greets arrivals to the city.

This 19th-century fountain's namesake animal isn't what you think it is.

Giant topiary dog once played a role in a terrorist bomb plot.

Inside a Scottish castle hangs the tattered remains of a flag with murky origins and supposed magic powers.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

These fantastically named natural pools look like something out of a Scottish myth.

On this stunning Scottish island, you can walk in the footsteps of dinosaurs.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

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