This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The "Seinfeld" diner.

Home to items never before seen by the public.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Northern Ireland's Brobdingnagian stepping stones.

The largest fountain in Bratislava.

Brass plaques embedded in pavement preserve the memories of those who lost their lives at the hands of Nazis during World War II.

Often mistaken as a medieval Gothic monument, this unique cornerstone only dates back to the 1980s.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

No one knows the origin of this creepy little stone man with an oversized phallus.

A sculpture of the beloved author surrounded by characters from his fairy tales.

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

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

A cynical face-off exposing the cost of war.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Macabre astrological automaton clock dating to the late 1400s.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A new sculpture calls attention to climate change in the centuries-old city it threatens.