Mercer County, US
Fort Clark Trading Post State Historic Site was once the home to a Mandan and later an Arikara settlement. Over the course of its history it also had two factories (trading posts). Today only archeological remains survive at the site located eight miles west of Washburn, North Dakota, United States.
Listen to the audio guide for Fort Clark Trading Post State Historic Site Free on WIP — starts by itself when you arrive, even with the screen off