A section of the anti-tank defences in Ashdown Forest, East Sussex.
The images above and below are of the anti-tank defences on the coast at Landguard Fort, Felixstowe. The site has an amazing collection of the history of coastal defence; it features visible works dating from the 1600's through to WW2. As you can see from the images, there was a substantial difference between the types used on the coast and further inland.