Durango, Colorado. Thirty-five acres surround this six-bedroom contemporary house with a creek running underneath and a 2,200-square-foot guesthouse. The three-level main home has cathedral ceilings with timber beams, wood floors throughout, and curved architectural details. Outside, there's a wraparound deck, a stacked-stone fireplace, and abundant woodland. $3,999,875. Samantha Gallant, Keller Williams Realty Southwest Associates, 970-375-3299. Aspen, Colorado.