Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

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

The remains of this misplaced church were moved here stone by stone.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

This lucky bronze frog was gifted to Madrid by a casino.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

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

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

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

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

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

A curious memento mori hangs in the magnificent Cathedral of Segovia.

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

Guitarist Paco de Lucía overlooks travelers as they pass through this train station dedicated to his legacy.

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

The fragmented remains of a massive public bath connected to the city's water supply.

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

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

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

This architectural oddity is an oasis of green on the outskirts of Valencia.