Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

27-room home built with the fortune of a sugar magnate.

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

One of few lasting examples of the brief octagon craze that developed into folly.

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

Golden Gate Park's historic collection of plants.

A man-made island in scenic San Francisco Bay.

The remains of a 12th-century chapter house in Golden Gate Park.

The miraculous hydrant that saved the Mission District in 1906.

This private residence was the template for one of the most beloved television homes of all time.

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

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.

Gold Rush-era tombstones line the park's paths.

Tiki luxury on Nob Hill.

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

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

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

Three vintage horses survived a 1976 inferno and found a home on a sister carousel.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

A Looff creation in Santa Monica best described as “a California-Byzantine-Moorish-style fantasy.”

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

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