3rd Century ancient architecture Burgh Castle England english field fort Great Britain historical landmark norfolk old Remains roman stone turrets walls bay blue cliff coastline Cornish cornwall hillside natural nature ocean rocks sea shore surf tide water waves power block building cloud futuristic glass height high London monolithic reflection shard sky skyscraper tall tower birds clouds lake peaceful reflections ripples summer Sussex swans tranquil trees view bog ducks habitat landscape marsh plants seep Surrey tree tussocks wet bank Basingstoke Canal canal green Hampshire river rural spring towpath travel animals domesticated farm hills livestock mammals meadow sheep South Downs Beachy Head chalk danger light lighthouse phare red warning white