Norwich, Norfolk, England, United Kingdom
The Boom Towers were built in 1344 to defend the approach to Norwich by water. The use of a chain across the water, between the two towers, controlled river traffic and prevented the unauthorised entry of vehicles. The eastern tower is known as the Devil's Tower.
Listen to the audio guide for Grey plaque № 8108 Free on WIP — starts by itself when you arrive, even with the screen off