A Spanish town built into the cliffs.

Moorish signal station on a stratgic rocky outcrop.

Rare karst landscape eroded from a flat seabed.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

340 bicycles, 65 feet high.

Discover for yourself what Herb Caen referred to as "the best kept secret in the Bay Area."

A monument to the love people have for their pets.

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

A huge musical instrument played by the ocean.

The only theatre in the world constructed specifically for sound movement.

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

Its buzzing collection honors vibrator history.

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

Seven ceramic sculptures are scattered around this California college campus.

This museum boasts the ninth-largest collection of insects in North America.

Recovered from the brink of extinction, at home in the Financial District.

A private home built to resemble the shape of a microscopic creature.

A man-made island in scenic San Francisco Bay.

A creepy steel gremlin has protected the Bay Bridge since 1989.

This (occupied) house is 10 feet wide and full of spite.

Over 300 taxidermied animals in a Californian restaurant make for a taxidermist's dream and an animal lover's nightmare.

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

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