An ancient stone structure that, according to legend, was built by witches.

A stone structure built thousands of years ago on the Iberian peninsula.

These 7,000-year-old cave paintings depict life in Neolithic Spain.

Once used to calculate the various levels around the country.

An abandoned 6th-century monastery features a medieval map of the known world.

The spectacular geological formations make it one of the most impressive caves in Europe.

This humble bench is considered the most beautiful in the world.

A prehistoric cave in Spain contains paintings dating back to the Ice Age.

Medieval ruins nestled within a breathtaking swath of Spanish nature.

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

Head to the mountains to catch a glimpse of Spain's endangered subspecies of brown bear.

One of Europe's oldest yew trees has lived more than 2,000 years.

One of Europe's largest groups of dolmens remains largely off the typical tourist track.

The ruins of an ancient Celtiberian town with incredible rock-cut buildings and a Roman aqueduct.

Hundreds of preserved dinosaur footprints can be found along a hiking trail in this small village.

Fascinating exhibits of prehistoric and ancient artifacts displayed with a uniquely modern touch.

A neighborhood park in the city of Cáceres hides what some believe are revolutionary examples of Neanderthal cave art.

This Arab fortress was once the largest citadel in Western Europe.

These primitive rock paintings include a very beloved depiction of a woolly mammoth.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

A spectacular walk on the flank of a gorge.

Five million people are laid to rest here, more than the population of Madrid itself.

The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.