The miraculous hydrant that saved the Mission District in 1906.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

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

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

The first fresco Diego Rivera painted in the United States can be found in the former San Francisco Stock Exchange.

This tall and trim architectural oddity is one of the skinniest buildings in San Francisco.

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

A bronze tribute to a legendary Californian, the self-proclaimed "Emperor of the United States."

These WWII-era murals were initially booed as a libelous portrayal of the American dream but have survived multiple attempts to have them destroyed.