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

One of the best examples of the modernist movement in Madrid.

Dedicated to a young woman who broke gender barriers at the University of Madrid.

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

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

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

This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

This Art Nouveau gate still stands at the former entrance of a 20th-century Spanish writer's colony.

A statue commemorating a beloved stray dog who was adopted by the entire neighborhood where he lived.

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

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

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

An old, deep well, connected with a miraculous, divine rescue and the patron saint of Madrid.

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

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

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

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

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

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

A vault of safe-deposit boxes in an old bank has been repurposed as a time capsule of Hispanic culture.

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.

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

Remains of the lost church hide beneath this Spanish Parliament building.