This enormous censer uses a pulley system installed over 400 years ago.

A pair of gigantic baby heads greet passengers at Atocha Station.

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

The surviving remnants of a destroyed medieval church now stand in a public park.

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

These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

This enchanting green space houses a labyrinth lined with toxic plants.

This enigmatic artifact is a rare depiction of an ancient Iberian noblewoman.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

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

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

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

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

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

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

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

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

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

Seaside ruins of a settlement that date back to the first century B.C.

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

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

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

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