hadrians wall, northumberland national park, great britain

ancient archaeological archaeology architecture attraction border borders britain britannia britannicus british britons building castle cliffs clouds empire england europe excavation fort fortification fortlets foundations frontiers garrison grass grassy great hadrian hadriani hadrians heritage hiking hills history isles kingdom landscape limes low masonry mile national nature northern northumberland panorama park path pennines picts point post remains rocky roman rome scotland site steep strategically structure tourist trail travel uk unesco united vallum wall west western winding world