Pompeys Pillar National Monument, Yellowstone County, MT ID: 5033 | This file appears in: Pompeys Pillar View of interior cave wall with incised graffiti | 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, MTDateOct 2016 "Pompeys Pillar National Monument, Yellowstone County, MT" appears in: Pompeys Pillar