Elevated freight railway turned wildly successful urban park.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A crumbling hospital from the 1850s on Roosevelt Island.

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.

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

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Ride the subways of yesteryear.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

Sniff the Titan Arum's rotting flesh.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

One of the last Jazz Age "Wonder Theaters" in New York City.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

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

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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

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.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.