Grand Central Station - Main Hall - New York City

The Main Concourse is the center of Grand Central. The space is cavernous and usually filled with bustling crowds. The ticket booths are here, although many now stand unused or repurposed since the introduction of ticket vending machines. The large American flag was hung in Grand Central Terminal a few days after the September 11 attacks on the World Trade Center. The main information booth is in the center of the concourse. This is a perennial meeting place, and the four-faced clock on top of the information booth is perhaps the most recognizable icon of Grand Central. Each of the four clock faces is made from opal, and both Sotheby's and Christie's have estimated the value to be between $10 million and $20 million. Within the marble and brass pagoda lies a "secret" door that conceals a spiral staircase leading to the lower level information booth.