February 20th, 2011. Carrabassett Valley, Northern Maine. A non for profit Maine Huts and Trails and has 30 miles of uninterrupted cross country ski trails between several state of the art eco-friendly huts. Here, a dog named 'promise' running along a snow mobile caravan providing a luggage shuttle of guests belongings between the huts. Piotr Redlinski for The New York Times.