Mountain hotels come in all shapes and sizes, from rustic lodges to luxurious mega-resorts and everything in between; nowhere, though, is there anything like Dunton Hot Springs. Here, in remote southwestern Colorado, along the banks of the Dolores river, halfway between the ski town of Telluride and the Anasazi ruins of Mesa Verde, is an authentic ghost town, an abandoned century-old gold prospectors’ camp, renovated shack by shack and rehabilitated into a truly unique luxury hotel — a place...