Two words: Leaf Peeping. It may sound funny, but it's that age old pastime of enjoying the changing foliage, and, for lack of a better term, peeping at the leaves. But we don't think you should be limited to spying on the leaves, get out there and experience it. Feel the air as humidity gives way to a crisp breeze, throw yourself into a pile of freshly gathered foliage and take a hike though the seasons while summer fades into fall and fall into winter. Here are some of our favorite fall hikes around the country: