Rayleigh, GB
Rayleigh Castle (also known as Rayleigh Mount) was a masonry and timber castle built in the town of Rayleigh in Essex, England in the 11th century shortly after the Norman Conquest of 1066. All that exists today are the earthwork remains of its large motte-and-bailey.
Listen to the audio guide for Rayleigh Castle Free on WIP — starts by itself when you arrive, even with the screen off