The show pony of cave systems, Fantastic Caverns manages to live up to its name.

An epic statue dedicated to the memory of the 9th and 10th Cavalry Regiments of the U.S. Army

A massive museum preserving the United States culture and the home of Abraham Lincoln's sleigh.

The celebrated eyesore created by starry-eyed sweethearts.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This highest peak in New Mexico is named after an explorer who had a habit of lending his moniker to peaks.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

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

The only castle in North America to ever house European sovereigns.

A little sculpture with a large wardrobe.

Secret North Korean passage discovered below the world's most dangerous border.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This 11th century tower is said to be the oldest building in Oxford.

The spot where three Protestant clergymen were burned at the stake during the reign of "Bloody Mary."

Get in line for Lisbon’s most famous sandwich.

Eat the ultimate iteration of Portugal's most beloved pastry.

The world's oldest bookshop still in operation.