Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

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.

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

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

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

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A crumbling hospital from the 1850s on Roosevelt Island.

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

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

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

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

The most confusing clock in New York.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

Commemorating the spot where the famous scientist fed his pigeons.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

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