A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

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

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

Sanctuary on a ridge near an ancient shrine to a "Black Madonna" built by the founder of Opus Dei.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

"Satisfying" is a good way to describe these beautifully aligned rows of Spanish mills.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

Remote, beautiful, and stigmatized, Las Hurdes is Spain's version of Appalachia.

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

A medieval village holds a very modern hotel.

Giant granite sculptures representing family on the northern coast of Spain.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

Rare karst landscape eroded from a flat seabed.

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

This ancient Spanish castle sits high upon a hilltop.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.