Ruins of a Carnegie family mansion on Cumberland Island.

A stealthy Apache hideaway that became the haunting site of a mass grave.

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

A unique collection of old miners' cave homes carved in to the hillside cliffs near Death Valley.

A lawless town deep in Death Valley was famous for its riches and death rate.

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

One of the most unusual geological features, recognizable from a dozen hit movies.

A mountain range on an active U.S. Navy base hides thousands of mysterious prehistoric rock carvings.

This impressive tunnel was dug entirely by hand over the course of 36 years.

The liveliest ghost town in the state.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A volcanic cone that formed over 600 years ago.

Towering basalt columns, a creation of fire and ice.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

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.