Heritage Open Day: Nothe Fort is Weymouth's number one heritage attraction. Located at the entrance to Weymouth Harbour, the Fort offers excellent 360 degree views across Dorset's Jurassic Coast. Nothe Fort is Weymouth's No. 1 heritage attraction, offering fantastic 360-degree views across Dorset's Jurassic Coast. Built as a Victorian coastal defence, Nothe Fort was used during WWII and had a secret nuclear shelter built during the 1980s. Nothe Fort was saved from dereliction by Weymouth Civic Society, and today is run by an army of local volunteers. Discover a maze of underground tunnels, nuclear shelter, a museum, parade ground, and large guns positioned high on the ramparts. We recommend 2-3 hours to see everything.