The Beartooth Highway is an All-American Road on a section of U.S. Route 212 in Montana and Wyoming between Red Lodge and the Northeast entrance of Yellowstone National Park, passing over the Beartooth Pass at 10,947 feet above sea level.

The late CBS correspondent, Charles Kuralt, called it "the most beautiful drive in America".
I think he may be right. There are lots of steep zigzags and switchbacks as the elevation changes from 5200 feet to 10,947 feet. I would like to drive this road again.