One of the smallest bookstores on the planet.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

The world's largest wooden structure.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Sample Spanish wines under frescoes in a historic monastery of "barefoot old men."

Rare karst landscape eroded from a flat seabed.

The extensive relics of an ancient Roman and Phoenician fish processing plant hide in a town park.

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

Built thousands of years ago, this wall is still part of the urban layout of this village.

A masterpiece of Gothic-Mudejar design in Ciudad Real.

At least according to the Guinness World Records.

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

This 18th-century water provider for Aranjuez was refurbished in 2013 only to be neglected again.

Not far from Madrid, a set of perfectly preserved trenches date back to the Spanish Civil War.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

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

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

A network of hundreds of interconnected wineries in caves hides under the town center.

This haunting location was featured in the final scene of a classic spaghetti western.

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

Giant topiary dog once played a role in a terrorist bomb plot.

This magnificent brick dome was made with an unusual design method.

An out-of-place grove of sequoias thrives in northern Spain.