A collection of huge, site-specific sculptures sitting in the Montana woods.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

The most beautiful Taco Bell in the world even has surfboard parking.

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

This infamous prison has a store where you can buy goods crafted by incarcerated people.

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

A gap in the concrete has been transformed into a miniature playground for the mind.

A large instrument played by the wind.

Dive bar built out of the remains of a whaling ship.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.

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

A man-made island in scenic San Francisco Bay.

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

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

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

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

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

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

Gold Rush-era tombstones line the park's paths.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

Furniture tries to escape an abandoned building in San Francisco.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

This private residence was the template for one of the most beloved television homes of all time.