A castle that was built stone by stone by an eccentric journalist.

A strange house built only at night, with rumored mystic inspiration.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Olfactory delights in San Francisco's Botanical Gardens.

Towering basalt columns, a creation of fire and ice.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

The rocks in this arid basin leave trails of movement behind them.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Shop selling 500 flavors of soda has something for everyone.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

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

This shop specializes in oddities and Victorian-inspired wonders.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

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

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.

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

A huge musical instrument played by the ocean.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

An alley covered with 20 years of bubble gum.

A Mysterious Masonic tomb in San Luis Obispo.