The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

One of the ghostly stops along Route 66.

The ghost town that ended up on Ebay.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Don't blink or you'll miss it.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

The liveliest ghost town in the state.

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

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

A huge musical instrument played by the ocean.

The legendary building that needed ghostly approval before being built.

A trash dump made beautiful by nature's power.

A hand-built folk art installation covered with messages of God's love.

A hotel and restaurant serving as the mecca of kitsch.