This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

A Christian monastery stands on what was once a holy Incan temple.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

Single runway interrupted by a busy road that cuts across its middle.

Red, white, and blue painted steps along with a Union Jack celebrate the outcome of Gibraltar's 1967 referendum.

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

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Rare karst landscape eroded from a flat seabed.

This surreal-looking tree pruned more than 1,000 years ago is still producing olives for oil.

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

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

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

According to tradition, King Phillip II supervised construction of the seat of his empire from this seat carved into rock.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

Mysterious Spanish catacombs of unknown origins.

A huge cathedral single-handedly constructed by one eccentric monk.

The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

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

This technological marvel is one of the world's first 3D-printed bridges.

A beautiful little castle with a rich history now home to the Archives of the Spanish Air Force.

A subterranean relic of the Spanish Civil War hides below this picturesque park.

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