Nothe Fort crowns the little Nothe Peninsular, guarding Weymouth and Portland Harbours.
It was built in the middle of 19th century, when the British got worried about the built up of the French navy. Its circular sides had casemates for cannons, covering the two harbours.
The fort came into its own during World War II, watching out for German bombers and containing anti-aircraft ammunition.
It is now a museum — the extensive underground network now houses displays on war and military artfacts, and the circular walls offer great views across Nothe Park and the harbour.