bay beach cliffs coastline Cornish cornwall cove England english Great Britain low tide natural nature ocean river sand sandy sea sheltered shore water waves hills bins bush bushland clearing gravel gravelled open picnic area protection provision public recreational rocks rubbish bins seats shelter shrubbery tables trees vegetation water tank boulders spring tide wild abstract angles appearance build building constructed construction exterior materials partial patio roof roofing structure surface surfaces texture textured textures thatch thatching trendy woodwork interior hill allied architecture armed forces army Bomb Shelter channel D Day dday France II june military Military Invasion normandy old ruin sand dune usa war