Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

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

This print shop boasts one of the largest pinball arcades in San Francisco.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

Amazing meticulous gardens of personal wood carvings, Hydrangea, Canna, and many other flowers.

Early prototype for Frank Lloyd Wright's Guggenheim.

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.

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

A man-made island in scenic San Francisco Bay.

San Francisco's most expensive hotel suite includes a secret passageway rumored to have been used by JFK.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

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

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

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

This 19th-century church is now a popular roller rink.

Half of a house.

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

A Barbary Coast watering hole built into a Gold Rush shipwreck.

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

A promotional sun clock on the site of San Francisco's great raceway.

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

A monument to the love people have for their pets.

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

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.