This is the remains of Bodiam Castle, with the ruins of the Barbican gatehouse to the left. The original wooden portcullis, an extremely rare example of its kind, can still be seen in the impressive main gatehouse to the right of the Barbican.
The castle was built in 1385 by Sir Edward Dalyngrigge a soldier of fortune. At the time the castle gave the impression of impregnability but was also a very comfortable home set in beautifully landscaped grounds overlooking the Rother Valley. It's located at Bodiam, near Robertsbridge, East Sussex UK.