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

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

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

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

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

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

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 psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

A glimpse at Walt Disney's vision for a "community of tomorrow," in miniature.

Though illegal, city officials have made an exception for this work of art.

A trek through the solar system here on earth.

This Buddhist temple is home to a number of towering statues spread over a peaceful wooded park.

The absurd creation is a compulsory destination for selfies in Buffalo.

This local landmark is home to art galleries and the area's only community darkroom.

Despite its extensive history, this fort saw little to no combat.

The once-abandoned 140-year-old hotel used in the movie "In Dreams."

One of 100 “Whaling Wall" murals painted in 13 different countries by a renowned marine life artist.

One of the few brewers in the U.S. experimenting with hop-free beers.

Final resting place of the two women killed on a small island off the coast of New Hampshire.

This small museum is an eccentric shrine to boyhood in the 1960s.