Notes are written in a log book with what wilderness crews came into the Bob Marshall Wilderness area and what times they headed out for the day at the Patrol Mountain Fire Lookout in Augusta, Montana, U.S., July 15, 2021. By around the 1950s, around 5,000 fire lookout towers had been built across the United States. Many have since closed, as infrared cameras and drones replace the human eye. The Forest Fire Lookout Association estimates that only around 400 lookout towers are still operational today. REUTERS/Brittany Hosea-Small SEARCH "WILDFIRES LOOKOUT" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES