From the record
“The Beartooth Highway is an All-American Road in the western United States on a section of U.S. Route 212 in Montana and Wyoming between Red Lodge and the Northeast entrance of Yellowstone National Park.”
Wikipedia article Beartooth Highway, CC BY-SA 4.0.
One of 81 National Register listings published here for Carbon County · listed in 2014 · category: District.
Sources: the Wikipedia article · the National Register database, National Park Service