Pompeys Pillar National Monument, Yellowstone County, MT ID: 5034 | This file appears in: Pompeys Pillar Overview of Visitor's Center with rock outcropping | Creator: Kate Hampton, photographer | Date: Oct 2016 | Source: Montana State Historic Preservation Office, Helena, MT. Download Original File CreatorKate Hampton, photographerSourceMontana State Historic Preservation Office, Helena, MT.DateOct 2016 "Pompeys Pillar National Monument, Yellowstone County, MT" appears in: Pompeys Pillar