In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

A violent name for a violent volcano.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

Years of archaeology, just chillin' by the water cooler.

These pretty kitties killed and ate as many as 135 railway workers.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

Rare signs of the former Soviet Union in the Caribbean, though not where you'd expect them.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

A clear blue swimming hole with hidden caves, still unexplored.

A sculpture of a flying hawk made from colorful car doors.

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

Every Sunday, Bogotá turns 75 miles of its city streets into a bicycle superhighway.

Colombia's biggest botanical garden contains plants from all across the country.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

Cathedral carved out of salt, located a mile below the earth's surface.