A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

The most isolated mailbox in America lets desert travelers record their passing.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

Since World War II people have been decorating this stretch of the Yuma desert with signatures arranged out of rocks.

Ancient human, animal, and geometric figures drawn in the earth.

The cluster of boulders near Fort Irwin is covered in military insignia.

Peek inside this sandy mailbox and you'll spot kids' letters to Santa.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Legendary frontman of the Doors looms in this giant mural by famed Venice muralist, Rip Cronk.

60 feet of towering steel balances gracefully.

A second generation sun-powered marvel lights up the night.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

One of the first skyscrapers in Santa Monica, and a famous getaway for the Hollywood elite of then and now.

Giant origami crease patterns engraved in Santa Monica intersections may even be visible from space.

The show's fictional Korean medical camp was created in the Santa Monica hills.

America's most famous piece of self-built architecture.

The sun acts as a key that only fits this giant keyhole twice a year.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

The 10-foot-wide Long Beach home was built on a dare.

These four islands right offshore have waterfalls, colorful lights, fancy buildings, and a secret purpose.

Fourteen curious and controversial white bunnies sit in a circle near Newport Beach City Hall.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.