Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

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

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

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

A psychedelic labyrinth on the San Francisco bay.

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

A modern mechanical planetary system, part of a 10,000 year clock.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A huge musical instrument played by the ocean.

Inside this museum, the history of the Walt Disney Family empire is on full display.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

This lighthouse has been guiding shipping into the Golden Gate since before the American Civil War.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

Internationally-recognized arts center housed in a century-old former military barracks.

Concrete strongholds stand guard over the Golden Gate.

Once the gateway to the utopian dream-village of a Civil War embalmer.

One of the last remaining Carpenter Gothic churches is situated on a wildflower conservatory overlooking the bay.

Social saloon from a scrapped trans-Pacific 19th century steamer.

A living time capsule of the 1960s Richardson Bay water-front.

An abandoned, unfinished mansion on grounds strewn with lava rocks.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.