Only two of these trees remain in the natural world, found high in the cloud forest of the island of Mauritius.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

An optical illusion found amid a logged redwood forest.

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

Bits and pieces from the ill-fated Donner Party's winter cabins.

A trash dump made beautiful by nature's power.

Celebrating the transformation of trash into objects of beauty.

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

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

A tiny survivor of the Donner Party disaster.

The largest drain hole in the world.

The haunting ruins of Jack London's dream house.

'Cause the fence start shaking, the earth was quaking.

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

San Francisco Bay's ghost town.

Concrete strongholds stand guard over the Golden Gate.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A winding path built in secret on the edge of the continent.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A hidden subterranean installation offers a view of the sky.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

San Francisco’s condensed garden of incredible plant growth.

A huge musical instrument played by the ocean.