The Grand Central Station (official name is Grand Central Terminal or GCT) is one of two main train stations in New York City. It is located on 42nd Street between Lexington and Park Avenue (called Midtown East) and serves the Metro-North Railroad service, which connects New York City to upstate New York and Connecticut.
The current GCT building was completed in 1913. Over the century or so, it has undergone several major renovations, the last of which was in 1996-8, famously championed by Jackie Kennedy Onassis. Unfortunately, she did not live to see the finished product. She died in 1994.
This photo was taken on a slow shutter speed to capture the movements of commuters at the train station.