Olfactory delights in San Francisco's Botanical Gardens.

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.

A huge musical instrument played by the ocean.

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

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

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

A psychedelic labyrinth on the San Francisco bay.

This diner's a kitschy dreamland for anyone whose heart is stuck in the 1980s.

This 19th century hydroelectric powerhouse was the first of its kind.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

Where manatees are the snowbird vacationers in these balmy Florida springs.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

The history of sea-faring refuse and disaster is on cramped display in this Netherlands folk museum.

A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

A true Valhalla for cactus and succulent lovers.