“In the winter, the only way to reach those rugged slopes and deserted mining outposts not accessed by ski lift is by Nordic skiing (really hard) or snowmobiling (really fun). Telluride Outfitters runs tours to Dunton Hot Springs and Alta Lakes observatory, where you’ll pass beaver ponds, America’s first AC power lines, and Alta ghost town—in 1875, the main 10-room wooden bunkhouse used to house 180 miners over two 12-hour shifts, each paying $1 a night for the privilege.”