Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

Russian history in San Francisco.

The remains of a 12th-century chapter house in Golden Gate Park.

Fonts are born and bred here at the oldest letterpress type foundry in the United States.

A man-made island in scenic San Francisco Bay.

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.

The miraculous hydrant that saved the Mission District in 1906.

A promotional sun clock on the site of San Francisco's great raceway.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

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

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

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

Natural sonic phenomenon comes with a grisly legend of murder and blood.

This popular pilgrimage site offers a hole filled with holy healing dirt.

A unique geological area spiked with wind-carved rocks that resemble teepees.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

These aggressively sustainable art homes look like something out of 1970's science fiction.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

A multi-storied adobe complex has been inhabited for more than a thousand years.