New York City's Grand Central Terminal houses a hidden tennis court known as the Vanderbilt Tennis Club. It is located on the fourth floor and is accessible to the public. Beneath the bustling streets of NYC lies the Old City Hall Subway Station, an architectural marvel that closed in 1945 but can still be viewed on special tours.
The Empire State Building has its own ZIP code, 10118, due to the sheer volume of mail it receives. Additionally, there is a secret 103rd floor, above the famous observation deck, which is generally off-limits to the public.
In Central Park, the Central Park Zoo has a time capsule buried beneath it, intended to be opened in the year 2859. The Statue of Liberty has a little-known feature: a broken chain and shackle at her feet, symbolizing the abolition of slavery.
The New York Public Library has a room known as the Rose Main Reading Room that spans nearly two city blocks, with a ceiling mural that depicts a sky with clouds. Below the library is an underground storage area with over 125 miles of shelving.
The Brooklyn Bridge has a hidden wine cellar that dates back to when the bridge was constructed. The revenue from leasing these cellars helped fund the construction of the bridge.
In the Rockefeller Center, there is a private underground tunnel used by NBC employees to move between studios. The Metropolitan Museum of Art has a hidden room called the "Astor Court," modeled after a traditional Chinese courtyard.
Located in the Waldorf Astoria Hotel is a secret train platform known as Track 61, which was used by President Franklin D. Roosevelt to discreetly enter the hotel.
The Flatiron Building has a triangular shape that causes unique wind currents, leading to the nickname "Cowcatcher" for the area around it, due to the wind blowing women's skirts up in the early 20th century.
In Times Square, there is a hidden studio called Times Square Studios where the New Year's Eve ball drop is orchestrated. Beneath Times Square is a system of tunnels and rooms used during World War II as a fallout shelter.
The Museum of Modern Art (MoMA) has a hidden garden on its rooftop, which is not open to the public.
Finally, the New York Stock Exchange has a hidden trading floor beneath the main one, known as the "Blue Room."