roman wall at caw gap

northumberland ancient monument archaeology britain british caw gap cloudy country countryside crags day england english europe famous footpath grassland green hadrians wall hiking hills historic iconic landmark landscape lichen moorland moors national park nature north northern outdoors path pennine rocks roman rural scenic sky stone tourism travel unesco world heritage site visitor attraction walking weather hadrian#39aph39#s beautiful popular walkers hill highland mountain grass terrain plateau rock coast cliff cloud fell wilderness meadow ridge geology