A monumental cross hides in the trees in Golden Gate Park.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

Recovered from the brink of extinction, at home in the Financial District.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

The miraculous hydrant that saved the Mission District in 1906.

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

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

A 300-ship graveyard, with a few still visible at low tide.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

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

A psychedelic labyrinth on the San Francisco bay.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Notorious artist squat renovated into legal studios.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This working class sculpture pounds his hammer all the livelong day.

A wall of chewing gum moonlights as collective art.

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

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

A vast city of the dead, where the deceased outnumber the living by more than a million.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

An overlooked and unassuming engineering marvel.

Tiki luxury on Nob Hill.

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