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

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Abandoned bridge hidden deep in the San Gabriel Mountains.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

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

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

One man's homage to the sun continues to grow like a glass fractal.

A psychedelic labyrinth on the San Francisco bay.

A 140-year-old castle with underground caves hidden in San Francisco.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

The ghostly remains of an accidental sea.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A towering bronze statue memorializes the founding father of postwar American conservatism.

This memorial pyramid marker honors one of the United States Government's first official camel riders.