When your face and fingertips are numb from the cold outside, a visit to the American Museum of Natural History on the Upper West Side of Manhattan not only thaws the ice out of your system, it also funnels a little more wisdom into it! And at the Morgan Memorial Hall of Gems you're surrounded by sparkling jewels. Just in case you're looking for a rock of your own: the Diamond District is a only brief subway ride away. Photo credit: Marley White.