Likely the most colorful in the metro network, this mosaic was installed back in 1995.

A “floating horse” hangs menacingly over the heads of passersby.

This striking gate in Carabanchel is a modern expression of Madrid's centuries-old connection to bears, the animal that has symbolized the city for generations

The oldest surviving example of the aqueducts that crossed the Casa de Campo to distribute water.

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

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

A Roman bridge closed to car traffic in the 1990s now open to foot traffic.

This larger-than-life lime green gummy bear sits in the middle of a roundabout in Spain.

The oldest vestiges of Madrid found here, have been incorporated into this new museum.

An Antoni Gaudí masterpiece in Astorga.

This roundabout commemorates the fourth International Polar Year.

Mural dedicated to one of Spain's favorite cartoonists, Francisco Ibáñez.

A giant hand emerging from the ground beckons visitors into a park in Madrid.

Part of the wall is preserved in the aptly named Parque de Berlín in Madrid.

An ode to the famous Las Vegas signage.

A model solar system adds a celestial touch to this suburban park.

Many miles south of Loch Ness, a similarly-named sea monster stands at the center of a roundabout.

This haunting location was featured in the final scene of a classic spaghetti western.

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

This enchanting hamlet carved into the rock looks like something straight out of Tolkien's Rivendell.

The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

Nicknamed the "Spirit of Paul Klee," this colorful apartment building features an array of multicolored panels.

This house covered in small stones was the work of one man over the course of nearly 30 years.

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