One of only two commuter aerial tramways in the United States.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Elevated freight railway turned wildly successful urban park.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A crumbling hospital from the 1850s on Roosevelt Island.

Furniture tries to escape an abandoned building in San Francisco.

A modern frieze of ancient Grecian mythological figures playing a national pastime.

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

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

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

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

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

Only hotel where you can legally launder money.

Art in the form of a winding, man made crack in stone.

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

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

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

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

The key to turning shifting dunes into the green oasis of Golden Gate Park.

Faceless white figures loom over the city from the rooftop.

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

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

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