This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

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

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

A towering monument in Spain has proven to be more labor-intensive than initially planned.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

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

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

This postmodern apartment block was designed to be a vertical neighborhood.

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

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

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

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

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

A lush indoor jungle fills this bustling Madrid transportation hub.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

An ancient Egyptian temple in the middle of Madrid, Spain.

The classic Atari game's iconic aliens have invaded downtown San Diego.

A hidden courtyard houses early 20th-century plaster masterpieces.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

One of the largest trees of its kind in California.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.