A toxic ghost town sitting atop a massive coal fire.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

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

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

A vast city of the dead, where the deceased outnumber the living by more than a million.

A classically inspired temple in Redwood City.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

This giant shopping mall still holds signs of its automotive past.

From the Difference Engine to the Cray-1, all under one roof.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.