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

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

“Invented in Key West, Perfected in Brooklyn."

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 Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

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

A bit of retro transportation flair preserved in the world's largest department store.

Bowl in splendor, if you're lucky.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Unique antiquarian shop specializing in globes, maps, and prints.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

Nikola Tesla's former home contains an homage hidden from plain sight.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

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.

A very classy 1920s-era bar right in Grand Central Station.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

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