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

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

The world's longest known cave system.

Famously misunderstood wonder of the ancient world

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A museum dedicated to the history and exploration of both popular music and science fiction.

A walk through the historic city center, under the streets of Seattle.

The fairy tale castle of the "fairy-tale king."

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

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

Oldest building in California still in use.

Where there's quartz, there must be gold. Thus is the story of the mines of Julian, and the titillating times of the Gold Rush.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

One of the largest trees of its kind in California.

San Diego's most historic and haunted home.

A large sculptural artwork and garden in Escondido, California.