The fort is situated at the end of the Nothe Peninsula, which juts eastwards from the town of Weymouth, and the harbour. The coastal defence was built between 1860 and 1872 by 26 Company of the Royal Engineers to protect Portland’s harbour, which was then an important Naval Base. It is shaped like the letter D, the fort’s guns covered the approaches to Portland and Weymouth harbours. The design included bomb proof casemates for cannons arranged around the circular sides, and deep magazines beneath the straight, landward side. The fort had an important role during WW2, when the harbour was used as a base by the British and American navies. Now a museum it is closed at this time for the winter.
looking out towards portland harbour from Nothe Fort you can see the old forts on the harbour breakwaters.