Downieville's largest Gold Rush structure still standing has one of the longest bars in California.

Treehouse motel and treehouse-building school.

Canyon walls shrouded in ferns.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

This abandoned motel doesn't welcome guests anymore, but decay and a creepy atmosphere still call it home.

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

This lesser known Hearst estate is a fairytale village built from the stolen bones of historic European buildings.

Gold Rush-era tombstones line the park's paths.

A huge musical instrument played by the ocean.

A B&B on a Victorian lighthouse station in San Francisco Bay.

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

A psychedelic labyrinth on the San Francisco bay.

A rococo retro-futurist future-rustic vernacular between yesterday’s tomorrow and the future that never was.

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

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

The capitol city's oldest existing cemetery.

An eccentric home stands out in an otherwise average neighborhood with mosaics, mini topiaries, and kinetic sculpture.

The first U.S. town to secede from the Union, only to vote themselves right back in.

Get a taste of the Wild West and a glimpse into the gold rush in Goldfield's oldest continually-running business.

Only intact Ichthyosaur skeleton in the United States.

A popular tourist cave with a dark past.

This cave was hidden for thousands of years, storing the worldly goods of ancient Native Americans.