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

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

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

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

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

A New York garbage depot holds a secret collection of weird and wonderful refuse.

More gold than anywhere else, ever.

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

Visit the monolithic tomb of America's most famous general.

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

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Elevated freight railway turned wildly successful urban park.

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

Try not to get slimed in Tribeca.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

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

Tucked in the back of this amazing antique store is an important piece of medical history.

A crumbling hospital from the 1850s on Roosevelt Island.

A terrific purveyor of natural history objects and curios.

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

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.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.