Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.

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

The former sign of this immortal music venue is just that--undying.

A hidden "place of interment for gentlemen."

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

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

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

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

Red frames showcase remnants of one of New York's original subway stations.

The most confusing clock in New York.

Nope, not Washington Irving's house.

The notorious headquarters of a corrupt political machine.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

The one-time office of the architectural firm that ushered in the Gilded Age is now a Club Monaco.

A good place to research the Freemasons, esoterica, occultism, and hermeticism.

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

This vacant church in the Financial District was once the heart of New York's first Syrian immigrant community.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.