Red frames showcase remnants of one of New York's original subway stations.

Plot your trip through the city on the sidewalk.

Avoid gangster interaction while window-shopping.

A terrific purveyor of natural history objects and curios.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

Unrepaired walls from a 1920 anarchist bomb attack.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Concrete strongholds stand guard over the Golden Gate.

A living time capsule of the 1960s Richardson Bay water-front.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

Once the fastest ship from San Francisco to Tahiti, the Galilee now lays in pieces in three different cities.

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.

An overlooked and unassuming engineering marvel.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A huge musical instrument played by the ocean.

A rococo retro-futurist future-rustic vernacular between yesterday’s tomorrow and the future that never was.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Furniture tries to escape an abandoned building in San Francisco.

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