Beautiful Victorian buildings from L.A.'s forgotten architectural past.

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

The largest drain hole in the world.

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

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

The largest permanent Monopoly board makes one of the longest games even bigger.

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

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

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

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

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

A common entry point to the Griffith Observatory trail holds its own wonders.

A modern mechanical planetary system, part of a 10,000 year clock.

Visible below the waves are memorials to the city's Gold Rush dead.

An inconspicuous footbridge beloved by San Diego locals.

A ghost town at the airport is now a refuge for blue butterflies.

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

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

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

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

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

Canyon walls shrouded in ferns.

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