This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

An annual extravaganza of Broadway theater memorabilia.

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.

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

Slyly buy a shake in the Parker Meridien lobby.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

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.

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

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

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

A living archive of urban activism and space reclaimed.

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

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

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

This unusual subway stop was originally a real estate office.

19th century cemetery hidden in Brooklyn's Prospect Park.

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

The notorious headquarters of a corrupt political machine.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

Once America's longest-manned military fort, now an abandoned hulk.

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