Phil Mortillaro uses keys to bring art back to the Village.

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

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

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 lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

Hidden inside one of the world's most well-visited zoos is a secret plaque promising eternal life.

The first and only carousel with a lineup entirely of insects.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

A museum dedicated exclusively to the lore and history of ouija boards.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

A quiet memorial marks the spot where the victims of the Salem Witch Trials were executed.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

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

This elaborate tunnel is the first structure composed of cast concrete in the United States.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Mysterious stone tower featured in many alternative histories of the New World.

Ironically this massive termite is the mascot for a company that is acclaimed for killing his kind.

Try a classic Necco candy bar being resurrected in a small suburban shop.

A daily replay of the experiment that proved the rotation of the Earth.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

Ice cream stand, snack bar, and time capsule of milk conveyance.