Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A museum dedicated to the alleged Roswell Incident.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Four hundred granite steps were built into this massive rock by the National Park Service.

An alley covered with 20 years of bubble gum.

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

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

Get up close to emus and ostriches, or buy their tasty meat.

Golden Gate Park's historic collection of plants.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

Quite simply the largest tree in the world (by volume).

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Shop selling 500 flavors of soda has something for everyone.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.