The Flatiron Building is pretty neat to walk or drive by. Our family was astounded at how flat it actually is. You won't believe it until you see it in person! We didn't go inside the building or anything, but it was part of our bus tour. If it's not too far out of your way, I would recommend stopping by. It's pretty interesting architecture!
Okay, this really isn't a destination in itself, but the Flatiron Building is such a unique building. It's definitely worth a stop, even just for a few minutes. We made it a point to stop by on our recent NY trip. It's possibly the flattest skyscraper in Manhattan. Plus, from my son's ABC NYC Book, it was fun to look for the letter "F" item. The building is situated on its own triangular block. We admired it from across the street at a pedestrian plaza that had tables and chairs for people to sit.