Art historians have debated the identity of this medieval stone rider since the 19th century.

This castle has links to Portugal’s founding and struggles for independence.

A replica of the Roman emperor in glorious full color.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

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

This ancient theater was once the home of fierce gladiatorial battles.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

The palatial McDonald's that inspired Wesley Willis.

Hot Doug's "Hot Dog" Stand.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

To find the "unicorns of the deep" you've got to go downstairs.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

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

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Three buildings constructed of over 25,000 multicolored glass bottles.

This engineering marvel is the longest bridge in Canada and one of the longest spans in the world.

Go inside the house that inspired L. M. Montgomery to create one of literature's most beloved heroines.

Rusty red sands line the shores of this Canadian Province.

This ancient jade mask depicting the Zapotec bat god was found in the ruins of the pyramids of Monte Alban.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

It's said this was once the home of King James V's pet lion.

This tiny island is home to the world's largest colony of Northern gannets.