The forts and mile castles of Hadrians Wall which recall days of fierce border raids stretches for 73 miles straddle the southern edge of the Northumberland National Park, that was one a no-man's-land between England and Scotland. In the last century it was the birthplace of the railways with Tanfield Railway housing an impressive collection. The defenses have become museum pieces and railways turned into paths for walkers and trackways for cyclists, an ideal way of seeing Northumberland