Camber Castle is a 16th-century fort, built near Rye by King Henry VIII to protect the Sussex coast of England against French attack. The Castle's history was problematic and short-lived. In the 16th century the surrounding harbours began to silt up and the coastline receded away from the fort, eventually placing it well in-land. The castle still remained operational up until 1637, when it was closed by King Charles I. It is now operated by English Heritage Trust, who open it to visitors one afternoon per month. The fort remains unmodified or unrestored and is protected under UK law as a Grade I listed building. I walked about 2 miles out of Rye, amidst a field of grazing sheep, to explore the decaying castle.