The oldest living tree in Manhattan comes shrouded in sinister legend.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

Detailed facade of a brownstone in Boerum Hill.

The famous author's cottage hideaway.

Unlock the secrets of the conjuring arts.

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

The loneliest island in New York.

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

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

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

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

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Try not to get slimed in Tribeca.

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

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A crumbling hospital from the 1850s on Roosevelt Island.

A terrific purveyor of natural history objects and curios.

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

A former watering trough turned local heritage site.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

A peace symbol in Northern Ireland is among the world's largest hedge mazes.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

This Neolithic passage tomb forms part of a World Heritage Site.