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

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

A huge musical instrument played by the ocean.

This turn of the century masterpiece has a mysterious goaty interloper.

The best place in the park to test out your throwing arm.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

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

The restored and active Victorian-era final resting place of San Francisco.

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

The only visible piece of San Francisco's most famous shipwreck.

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

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

A century and a half of research in the sciences and natural history, still going strong.

Golden Gate Park's historic collection of plants.

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

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

A 90-acre park on former landfill that hosts an annual kite festival.

Olfactory delights in San Francisco's Botanical Gardens.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

An artsy hidden staircase leads to breathtaking views of San Francisco.

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

Half of a house.

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

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.