An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

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

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

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

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

Stormy conditions send jets of seawater bursting through holes in the cliffs.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

A contemporary art installation housed within a Gothic cathedral.

A breathtaking and biodiverse wilderness in the mountain setting of Ernest Hemingway's "For Whom the Bell Tolls."

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

You can soak in three relaxing pools filled daily by the tide.

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

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

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

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

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

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

A medieval village holds a very modern hotel.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.