A shining, cold, black organ lies in San Francisco's financial district.

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

This colorful boulder serves as a canvas for political statements and artistic expression.

This painted marvel is San Francisco's 400-foot ode to urban biking.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

This contorting sculpture is the tallest in San Francisco.

These subterranean storage areas hold emergency water reserves.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

This grinning pup statue is all that's left of what was once a ubiquitous Bay Area diner chain.

Inside this museum, the history of the Walt Disney Family empire is on full display.

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

Early prototype for Frank Lloyd Wright's Guggenheim.

An overlooked and unassuming engineering marvel.

The miraculous hydrant that saved the Mission District in 1906.

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

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

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

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

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

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A restored 1920s cascade stairway provides one of the best views of Oakland's Lake Merritt.