Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

A tunnel of hardened lava along Maui’s famous Road to Hana.

This black shoreline is made up of exploded lava particles.

Authentic gondola hanging from the ceiling, notable mural in the back room.

California's oldest existing theater building hosted an impressive cast of celebrities, including hosting Mark Twain's first lecture.

This Taoist temple is the oldest continuously used Chinese temple in California.

In the country around Buttonwillow, California, a marker commemorates a revealing moment in the story of a water colony from the fictional Kcymaerxthaere that sought independence.

Internationally-recognized arts center housed in a century-old former military barracks.

The world’s largest concentrated solar plant generates as many problems as megawatts.

Over 300 taxidermied animals in a Californian restaurant make for a taxidermist's dream and an animal lover's nightmare.

The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

From the Difference Engine to the Cray-1, all under one roof.

The longest burning light bulb in the world.

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

An abandoned car and strange wooden debris are among the scattered remains of the old sand and gravel quarry.

This (occupied) house is 10 feet wide and full of spite.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

Radioactivity still cause for concern at this urban explorer's paradise.

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

A promotional sun clock on the site of San Francisco's great raceway.

This stunning sea creature-shaped home blends into the landscape like a fantasy villa.

This 19th-century church is now a popular roller rink.

An overlooked and unassuming engineering marvel.