A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

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

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

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

The most metal church of all time was built in record time because of an international, pious pissing contest.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

A crucified and bearded female saint.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

A spherical "micro-nation" in the heart of Vienna.

Baroque celebration of the end of the Great Plague of Vienna.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Berlin's old airport.

The "Prussian Versailles" that is as glorious today as when it was built.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

A meteorite-bounded town in Bavaria.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

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