This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

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

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

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

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

The remains of a convent turned military barrack in the heart of Madrid.

Part of the medieval watchtower is displayed in an otherwise ordinary parking garage.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

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

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

An automaton perched above an classic clock and watch store

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

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

This enormous censer uses a pulley system installed over 400 years ago.

Iron Age runes and ruins hide in plain sight along this Portuguese beach.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

Ancient catacombs form the foundation for this Rococo orgy of a church.

The stunning interior of this Gothic church is covered in ornate gold details.

A hidden three-foot-wide house separates these two regal churches.