A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

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

A Spanish town built into the cliffs.

This remote location of this Moorish stronghold means it doesn’t attract many tourists—and that it still has the aura of fear and bravery of the 1300s.

Moorish signal station on a stratgic rocky outcrop.

A micro-communist utopia in Spain with no police, no mortgages and full employment.

Touching this little fossil embedded in the wall of a grand mosque-cathedral may make your wishes come true.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

A series of colorful murals breathes new life into old grain silos in Spain.

An abandoned airport in the middle of nowhere.

At least according to the Guinness World Records.

The water of this well in Toledo lost its sweetness after the death of a young love.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

Nicknamed the "Spirit of Paul Klee," this colorful apartment building features an array of multicolored panels.

This postmodern apartment block was designed to be a vertical neighborhood.

This enchanting hamlet carved into the rock looks like something straight out of Tolkien's Rivendell.

The prolific artwork of a self-taught sculptor.

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

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

The deserted remains of a luxury hotel turned hospital ward.

The world's largest sundial can cast a shadow more than 1,600 feet long.

Designed in the Romanesque style, this structure was once a fortress monastery.

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