Hike up the Old Gardiner Road behind the Mammoth Hotel to the first plateau, until you see the service road on the left.\n\nFollow the service road to the left across the hill.\n\nThe service road will start up the side of the hill and you will see two fenced-in utility areas. At the second of the two, head toward the top of the hill.\n\nAt the top of that hill, look around for the headstone of Mary Foster. You’ll also see other unmarked graves nearby, as well as panoramic views of the hills around Mammoth Hot Springs.