Inner Pierhead Fort
United Kingdom
Inner Pierhead Fort is a 19th-century fort built to defend Portland Harbour at the Isle of Portland in Dorset, England. It is positioned on the end of the inner breakwater, which abuts from the former dockyard of HMNB Portland. The fort was constructed between 1859-1862, and is 100 ft in diameter. The inner breakwater, including the fort, became grade II listed in 1978.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).