Cliffside houses provide a spectacular view from their perch above the valley.

Vibrant street art created with mixed media.

This house's itty bitty size means no humans allowed.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

The oldest building in Madrid.

This modernist bridge highlights the bear as a symbol of Madrid.

An uninhabited village that preserves and documents rural architecture and an endangered way of life.

This species of wild goat stars in witchy legends and frolics among the park's eerie rock formations.

This 18th-century project to build the world's tallest gravity dam was never completed.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The home and birthplace of Caroline Dormon, a naturalist, artist, and the "mother of the Kisatchie National Forest."

This amazingly preserved Gold Rush town is a historian's dream.

An ancient Egyptian temple in the middle of Madrid, Spain.

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

Paris' linguistic guide to the international language of, yes, love.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

A mysterious, ancient collection of pre-Hispanic petroglyphs hidden deep in the Mexican desert.

This natural wonderland is a unique chance to explore a Carolina bay, a mysterious geological formation of unknown origin.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A colorful public mural in San Antonio's West Side encourages students to stay in school.

The bombed out remains of the old church were kept intact next to the new one, as a reminder of the futility of war.

Every hour on the hour a naked heroine and her leering foil appear from this giant cuckoo clock.