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

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

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

Avoid gangster interaction while window-shopping.

Rummage through this sunken ship, but leave your scuba gear at home.

Cryptic messages embedded in the New York City sidewalk.

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

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

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A hidden "place of interment for gentlemen."

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

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

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

Elevated freight railway turned wildly successful urban park.

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

A crumbling hospital from the 1850s on Roosevelt Island.