Two New York rooftops are home to the largest rooftop soil farms in the world.

Experience Larry Spring's self-taught "common sense" laws of physics.

Only hotel where you can legally launder money.

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

The taxidermied remains of the "last wild grizzly bear in California" and of the symbol of the state of California.

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

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

Early prototype for Frank Lloyd Wright's Guggenheim.

Over 315,000 preserved amphibians and reptiles in jars.

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

Appropriation-friendly collection of books, periodicals, and more.

Alleyway plaque commemorating the death of a fictional character in The Maltese Falcon, not far from the author's home.

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

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

Golden Gate Park's historic collection of plants.

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

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

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

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

A hidden subterranean installation offers a view of the sky.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The remains of a ruined mansion memorialize the 1906 earthquake.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.