It's just about that time of year again: when tourists near and far descend upon New England to give the changing leaves a good look-over. Before you head out armed with a camera, a fanny pack and sensible shoes, don't you want to know who started this whole craze? We found out. Plus … we'll have a guide to the best leaf-peeping places, and discover why some experts think fall foliage might become a relic of the past.