Going-to-the-Sun Road in Glacier National Park, Montana. The only road through the heart of the park, it crosses the Continental Divide at Logan Pass (elevation 6,646ft). The heavy snowfalls of the mountains close the road in “winter,” though that effectively means it’s only open from about June (when the plows are able to clear last season’s snow) to October (when the next snowfalls hit). Many portions of the road, especially on the eastern side, lack guardrails: avalanches repeatedly destroy them.