A psychedelic labyrinth on the San Francisco bay.

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

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.

The rest of him lived another 61 years and was buried elsewhere.

A giant chess set, minus the psychedelic drug trip.

The largest permanent Monopoly board makes one of the longest games even bigger.

Concrete strongholds stand guard over the Golden Gate.

Monumental sculptures of Patrick Amiot, constructed from debris, detritus, and determination.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

An archive of nearly every day of Buckminster Fuller's life.

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

The only parking meter in the entire town, it is surrounded by 100 free spaces.

A rich history stashed behind an unassuming door in the heart of Gold Country.

Established in 1853, this crumbling cemetery sits forgotten on the corner of Church and Chapel in Gold Country.

The modest home of the very immodest dancer who cost a king his crown.

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

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

This museum looks at the history of one of America's most famous prisons and most beloved albums.

This corn maze so big you may want to pack a lunch, and possibly a flaregun.

Seven ceramic sculptures are scattered around this California college campus.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

One of the best absinthe distilleries in the United States.

Antiques by the Bay.

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