Grand Central Terminal is one of the most visited sites in New York City, with around 750,000 people passing through its storied passages each day. Though, many places within the over 100-year-old building remain hidden and unnoticed by the masses. From long-forgotten tunnels that once led to luxury hotels, to off-limits basements that do not even appear on blueprints, here are ten hidden places inside the iconic Grand Central Terminal.

To see some of these hidden sites in person, join Untapped New York for a tour of Grand Central. On this unique walking tour, you will discover the history of the Beaux Arts train station, from its glittering glory days to disrepair and modern quests to save it. Our top-rated tour guides will make you experience what most miss: its hidden features, design quirks, and more. Read on to learn the secret details related to the terminal’s hidden spaces. 

Grand central aerial

Tour the Secrets of Grand Central

1. The Glass Walkways

A man passes through the glass walkways in Grand Central Terminal.
A man passes through the glass walkways in Grand Central Terminal.

While most people will recognize the signature glass windows of Grand Central Terminal‘s atrium, many may be surprised to know that those windows contain walkways. If you look closely at the above photo, you will see someone crossing between the first zero in 100.

The catwalks that run across the massive windows connect offices so employees do not have to fight through the crowds within the station to get where they need to go. A special key and a bit of nerve are required to gain access and traverse the elevated glass pathways. You can see photos from Untapped Cities’ visit inside here!