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

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

A beautiful but toxic fountain of mercury.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A model solar system adds a celestial touch to this suburban park.

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

This lucky bronze frog was gifted to Madrid by a casino.

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

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

Commonly acknowledged as the only public monument to the Devil himself.