Check out Grand Central... by TempNomad
Check out Grand Central Station. People rush in and out of here constantly, and it is more appreciated now than ever, but too many never look UP or just stroll around. The bathrooms are decent now, and the star map is clear (look UP!), there are art shows, shops, food, lots of people watching, and trains to boot.
Grand Central Terminal is connected to the 4,5,6,7, and S trains. It also houses the Metro-North Railroad. Look on the web site for tour information (they're free!) on Wednesdays and Fridays at 12:30PM.
www.grandcentralterminal.com