“Invented in Key West, Perfected in Brooklyn."

Volunteer-run library dedicated to exploring five decades of activism history.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Sniff the Titan Arum's rotting flesh.

An artist's cute bronze subway sculptures belie his violent artistic past.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Lie in a hammock where George Washington stood.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A popular European tradition makes its way to the states on one of America's most famous bridges.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The "Seinfeld" diner.

Ride the subways of yesteryear.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Mysterious 500-year-old tapestries depict a unicorn hunt.

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 crumbling hospital from the 1850s on Roosevelt Island.

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