A small house sits between two huge rocks, with its back to the sea.

A subterranean relic of the Spanish Civil War hides below this picturesque park.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

A tower that pays homage to local sailors who perished under the waves.

A massive marble foot is tucked away in a small alley near the Pantheon.

A lonely beacon, precariously perched atop a remote sliver of rock.

A small sculpture garden that provides a microcosmic representation of California.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.