This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

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

This 18th-century water provider for Aranjuez was refurbished in 2013 only to be neglected again.

The ruins of the Sacred Heart Memorial, which was first “shot” by a weird firing squad and then dynamited during the Spanish Civil War

A collection of riverboats of the Spanish royal family in a quaint museum.

An eighteenth-century fantasy where monkeys, dragons, and Chinese courtiers emerge from walls made entirely of porcelain.

This brick obelisk serves as a vent for garden water distribution

A massive birdcage in this royal, 18th-century garden has sparked a local controversy.

This waterfall, also known as the “the castanets” is said to mimic the sounds of the waves in Portugal.

This bullfighting museum is part of a bullfighting coliseum (plaza de toros) built in the 18th century.

This 18th-century pond is one of the main attractions in the Jardín del Príncipe in Aranjuez.

At least according to the Guinness World Records.

An homage to the first Spanish cyclist to win the Tour de France.

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

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.

This ancient Roman cistern has been the source of many legends throughout the centuries.

This modest lottery shop draws hopefuls all year long, but come Christmas season, lines wrap around the block.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

Most visits to the Almudena Cathedral in Madrid ignore the eeriest part of the building, its crypt

This engraved safety pin has possible links to the haberdasheries located in this humble square

A home for Spain's version of the Tooth Fairy, hidden in an old gas company register.

An automaton perched above an classic clock and watch store

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.