Skewer up Kangaroo.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

The saddest little diner in New York.

During the American Revolution, this mansion hosted failed peace talks between the British and Americans.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

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

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

A whimsical, but often overlooked clock in Park Avenue.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Avoid gangster interaction while window-shopping.

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

Slyly buy a shake in the Parker Meridien lobby.

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

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

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

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

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A terrific purveyor of natural history objects and curios.

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