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

Tiki luxury on Nob Hill.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

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

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

San Francisco's newly reopened hands-on science museum.

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.

This shop specializes in oddities and Victorian-inspired wonders.

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

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

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

A psychedelic labyrinth on the San Francisco bay.

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

A huge musical instrument played by the ocean.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

An increasingly eccentric apartment building, topped with winged beasties.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

Perhaps the most unique of any Frank Gehry design for one simple reason: Gehry himself actually lives here.

This 1920s masterpiece of French Quarter architecture hides a secret tunnel used by Albert Einstein.

"Looks so real, it's scary!"