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

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Become a prohibition rebel.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

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

New York City's smallest piece of private property.

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

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

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

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.

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

Elevated freight railway turned wildly successful urban park.

New York's oldest magic store.

Try not to get slimed in Tribeca.

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

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

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

Temporary Burning Man sculpture made of two 18-wheelers.

An overlooked monument to the celebrity gangster who helped put the sin in Sin City.