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Barely was the work completed when Henry VIII's flagship, the Mary Rose, tragically sank in front of the Castle. During the English Civil War, nearly a century later, the Castle was captured for the only time in its history, by Parliamentarian forces.

Over the centuries, Southsea Castle's defences were strengthened so that it could continue to protect Portsmouth. In the 19thC a tunnel was built to defend the Castle moat. Visitors can still enter the tunnel and see how the Castle would have been defended against invaders.Atrillery, gun platforms and panoramic views from the top of the keep to the Isle of Wight and Solent.