These distorting, funhouse mirrors achieved fame in a renowned piece of Spanish theater.

The Spanish king's private bathroom embraced the idea of a porcelain throne.

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

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

A thorough look at the development and history of the underground's rolling stock of the Madrid subway system.

The tallest tower in Cáceres's Old Town.

King Carlos IV laid the first stone during construction of this chapel.

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

The largest and best preserved necropolis in the Western Mediterranean.

An open-air sculpture museum in a park in Alcorcón.

A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

This small museum tucked within a subway station holds pieces from Madrid's past.

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

This 18th-century project to build the world's tallest gravity dam was never completed.

Built thousands of years ago, this wall is still part of the urban layout of this village.

Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

A neighborhood represented by an apparent geocentric and flat-earth model of the Solar System is hidden in the subway of Madrid.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."