Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

A 300-ship graveyard, with a few still visible at low tide.

Visible below the waves are memorials to the city's Gold Rush dead.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Tiki luxury on Nob Hill.

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.

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

This shop specializes in oddities and Victorian-inspired wonders.

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.

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

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

An abandoned car and strange wooden debris are among the scattered remains of the old sand and gravel quarry.

A restored 1920s cascade stairway provides one of the best views of Oakland's Lake Merritt.

With statues of Nelson Mandela and Harvey Milk this monument has been called the Mount Rushmore of California.

A crumbling Beaux Arts monument to the Bay Area's age of rail.

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

This elaborate Hindu temple is located in a Chicago suburb, but looks like it was transported directly from India.

The oldest certified bowling alley in the United States is in the basement of this century-old bar.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.