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

Volunteer-run library dedicated to exploring five decades of activism history.

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

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

The famous author's cottage hideaway.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

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

Nondescript elevator doors open to reveal a stunning, surreal world.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Mysterious 500-year-old tapestries depict a unicorn hunt.

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

Sniff the Titan Arum's rotting flesh.

Ride the subways of yesteryear.

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

A hands-on traveling collection of the innovative devices of yesteryear.

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

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A crumbling hospital from the 1850s on Roosevelt Island.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

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

Try not to get slimed in Tribeca.

The seamy, underground secrets of Portland's criminal past.

Taking the 3D art experience far beyond blue and red glasses.