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

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

Olfactory delights in San Francisco's Botanical Gardens.

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

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

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

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

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

Furniture tries to escape an abandoned building 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 huge musical instrument played by the ocean.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

This research center for rare prosimians is studying how they sleep to help prolong human life.