Charleston, US
Fort Trenholm, also known as Battery Trenholm, is a historic artillery battery located at Johns Island, Charleston, South Carolina. It was built in 1864, to reinforce Fort Pringle and protect the Stono River and Johns Island. It has emplacements for 17 guns. The three-sided earthen redoubt measures
approximately 870 feet on its eastern face, 780 feet long on its southern face, and 885 feet long on its western face. It has a 15-foot-high parapet wall. It was listed on the National Register of Historic Places in 1982.
Listen to the audio guide for Fort Trenholm Free on WIP — starts by itself when you arrive, even with the screen off