Stuck in the middle of a modern Madrid city block are the remains of a 19th century sports complex.

A masterpiece of Rationalist architecture in the center of Madrid with lizards on it.

A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.

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

Infamous and now demolished panopticon prison built by its former inhabitants.

A small museum displays some of the artifacts discovered during a subway station renovation.

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.

This phone booth was recreated to honor "La cabina," considered the best horror film in the history of Spanish television.

The unfinished final resting place of some of Spain's most prominent politicians.

This open-air sculpture museum is located under a bridge in the center of Madrid.

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

Shrapnel, dynamite, bullets and Franco couldn't destroy this bust, rescued and kept hidden as a family secret for over 40 years.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

At this century-old barbershop, clients used to be entertained with a glass of brandy and a cigar.

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

Hidden under a center for the elderly are the dungeons which were used during the Spanish Inquisition.

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

A haven for book enthusiasts across the street from Retiro Park.

Known as the Casa de las Siete Chimeneas, this haunted 16th-century manor has a dark, mysterious past.

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

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

This sculpture pays homage to the street sweepers of Madrid since its inauguration in 2001 in Plaza Jacinto Benavente.

After the queen of Spain had a dream where these statues fell and crushed her, they were removed from the palace and given new homes around Madrid.

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