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

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

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

An iconic photograph from the Spanish Civil War saved this shrapnel-scarred historic house from destruction.

Replicas of fossils unearthed during renovation work reveal how this area would have looked millions of years ago.

This influential Renaissance-era library was once the haunt of kings and monks.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

A controversial art piece that harkens back to local folklore.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This chapel is the site of a yearly pilgrimage that originated during the Middle Ages.

A cluster of granite granaries perched on stilts.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

This enigmatic Roman tower lurks just outside Belmonte.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

Panoramic views from the mountains over a facility built to provide tuberculosis patients with fresh mountain air.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

This now abandoned restaurant provides some of the most amazing views of Lisboa.

This little-known national museum houses over 40,000 works of art from across the world.

Perhaps the most spectacular grotto along the Algarve coastline.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

This small chapel is built of human bones and decorated with a golden skeleton.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.