These curious caverns have been home to mushrooms, gangsters, and disco.

An amazing collection of sculptures and art.

A stone face watches over the river.

This secret gem of a toy store houses a rideable carousel populated with fantasy animals.

Robots, lasers, and whoopee cushions, oh my!

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

This striking art museum holds an amazing series of curiosity cabinets.

A place to eat for on-the-run agents and espionage enthusiasts.

The huge granite obelisk that towers over a small California town.

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

A huge musical instrument played by the ocean.

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

Furniture tries to escape an abandoned building in San Francisco.

Only hotel where you can legally launder money.

Tiki luxury on Nob Hill.

Early prototype for Frank Lloyd Wright's Guggenheim.

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

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

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

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

A rococo retro-futurist future-rustic vernacular between yesterday’s tomorrow and the future that never was.

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

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