A Mysterious Masonic tomb in San Luis Obispo.

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

A trash dump made beautiful by nature's power.

An extensive collection of ancient Egyptian artifacts and mummies.

The headquarters of a secretive order is also a beautifully-designed park.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Cows on a ranch are commonplace, scattered cow bones everywhere? Not so much.

Private collection of art inspired by cabinets of curiosity.

A storybook European village in Berkeley.

An vast warehouse of everyday treasures in Berkeley, CA.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

Native Americans built this circle of stones, which was used to predict astronomical events.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Abandoned bridge hidden deep in the San Gabriel Mountains.

Ruins of a Carnegie family mansion on Cumberland Island.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The 606 is a decade in the making.

The capitol city's oldest existing cemetery.

Its buzzing collection honors vibrator history.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

This massive mushroom has spent centuries eating its way across a huge swath of Oregon.

Local legend has it that an old, decaying staircase outside this cemetery is haunted by dozens of ghosts.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.