Newhaven Fort is a 19th-century fortification built to defend the harbour at Newhaven, East Sussex. The fort is situated on a hill overlooking the town and the River Ouse, and its strategic position allowed it to control the entrance to the harbour. The fort's design is typical of the Palmerston forts, a series of fortifications built during the 19th century to protect the UK from French invasion. The fort features a semi-circular rampart with a ditch on the landward side, and its walls are constructed from local flint and brick. The fort's armament consisted of cannons mounted on the rampart, and it was originally designed to accommodate 15 guns. Today, the fort is open to the public and features exhibits on its history, as well as offering stunning views of the surrounding area.