AdvertisementNational Parks Have A Long To-Do List But Can't Cover The Repair CostsMarch 08, 2016Nathan RottfacebookEmailThere are more than 150 historical structures at Joshua Tree National Park, like this schoolhouse at Keys Ranch. Jason Theuer's job is to decide which ones to protect and preserve, based on the available resources, and then do just that. He says it feels like being an ambulance driver. (NPR)