The largest drain hole in the world.

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

Nancy Thompson's Home from "A Nightmare on Elm Street."

Abandoned bridge hidden deep in the San Gabriel Mountains.

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

Small museum packed with artifacts recovered by the man rumored to be the real-life inspiration for Indiana Jones.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

This massive redwood tree has a hole in the base big enough to drive through.

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

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

The final resting place of a space program monolith.

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

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

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

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

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

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

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

Everyone remembers Laurie Strode from Halloween, but this is the house where most of the blood was shed.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

A 300-ship graveyard, with a few still visible at low tide.