Olfactory delights in San Francisco's Botanical Gardens.

A museum befitting the city responsible for supplying the majority of the world's LSD.

Rainbow-hued local gem in Venice.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

Its buzzing collection honors vibrator history.

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.

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

A hand-built folk art installation covered with messages of God's love.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Hidden in the hills of Hollywood, this secluded Oz-themed garden is dotted with dozens of thrones.

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

A one-of-a-kind collection of a unique medium.

Medical and zoological curiosities for sale.

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

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

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

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

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

World's largest collection of serial killer artwork and other macabre exhibits.

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

A psychedelic labyrinth on the San Francisco bay.