A psychedelic labyrinth on the San Francisco bay.

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

One of the last remaining venues on the Old Chitlin’ Circuit is a kaleidoscopic music hall at the end of a dirt road.

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

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

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

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

Try not to get slimed in Tribeca.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Ride the subways of yesteryear.

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

A dilapidated dock tells the story of Titanic's missed arrival.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

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

A huge musical instrument played by the ocean.