Fort Paull was a Napoleonic era fort built in 1542 to protect the port there. The site dates back to 910 when it was a lookout for Viking raiders. The current fort is designed as a pentagon and was built from 1861–1864. It was disarmed at the beginning of the First World War and replaced by two nearby forts. One was on Sunk Island; the other was at Stallingborough. In 1960 the fort was finally closed down. But in 1964 a group of volunteers took over the fort and made it into a Museum.