Milecastle 42, Hadrian’s Wall

The construction of Hadrian’s Wall began in AD122. It measured 73 miles and ran from Segedunum at Wallsend, across the width of the country to Bowness on Solway in Cumbria. Each mile there was a gateway through the wall which could be found at a milecastle, which was effectively a small fortlet and equally spaced between each milescastle were two turrets.