Eons old volcanic activity created one of the most stunning rock formations in the United States.

The ghost town that ended up on Ebay.

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

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Explore 10 acres of environmental sculptures.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

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

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

Towering basalt columns, a creation of fire and ice.

The rocks in this arid basin leave trails of movement behind them.

The ghostly remains of an accidental sea.

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

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

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

A huge musical instrument played by the ocean.

The site of murders and Satanic cult gatherings.

A ring of creosote bushes that are estimated to be 11,700 years old.

The biggest pinball arcade in the world has over 600 pinball machines, and 300 arcade machines.

In the days before HD projectors and IMAX, some of the most powerful projectors belonged to planetariums.

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