Farther north, along the Canadian border, the million-acre Glacier National Park becomes a hushed world of frozen lakes and snow-covered peaks in the winter. The first eleven miles of the famous Going-to-the-Sun Road are plowed and open year-round, from the West Glacier entrance to the Lake MacDonald Lodge. After taking in the views of the long glacial lake, you can warm up at Montana House, the only business in the park that’s open year round. Or you can opt instead to put on some snowshoes or cross-country skis and continue deeper into the park. No motorized vehicles are allowed beyond the few stretches of paved road, creating a serene atmosphere of solitude and silence. Another advantage of visiting in winter for naturalists is that the tracks of the 60 mammals found in the park—including elk, lynx, mountain goats, and bighorn sheep—are easier to spot in the snow.