A bit of retro transportation flair preserved in the world's largest department store.

An abandoned asylum where patients have been forgotten but their possessions remain.

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

The loneliest island in New York.

During the holidays, a vintage subway train whisks New Yorkers back in time.

Nikola Tesla's former home contains an homage hidden from plain sight.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

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

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

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.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

A once grand hotel is being retaken by the wilderness it once capitalized on.

An unassuming secret door once led to a legendary watering hole.

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

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

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

Collapsing castle on the Hudson river was once the storage site of military surplus business.

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

New York City's smallest piece of private property.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

Try not to get slimed in Tribeca.