ancient background brick cement course flints moss norfolk old pattern perspective sky stones texture wall grass barren border brown diagonal dissect divide drystone heather hill hillside mark stone cumbria dry stone England english farm farmland fell fields Great Britain highland hills landscape meadows real estate road thoroughfare travel upland view walls garden green halophyte leaves natural nature plant rosette succulent xerophyte xerophytic arch archway Asia battlements china construct construction fort garrison Great Wall landmark protect protection slope steep tourist attraction tree walk walkway wonder attraction forest panorama tourist bricks castle dawn dusk evening fortress guard medieval protest tower trokai