How long is Hadrian's Wall (in miles)?

Hadrian's Wall stretches approximately 73 miles across northern England. Constructed under the Roman Emperor Hadrian starting in AD 122, this remarkable structure served as a defensive fortification marking the northern limit of the Roman Empire in Britain. Its length is a significant aspect of its historical and cultural importance, showcasing the ambitious nature of Roman engineering and military strategy during that period. The wall included forts, smaller milecastles, and watch towers, all of which played a crucial role in the control of movement and trade across the border. The figure of 73 miles accurately reflects the documented measurements of the wall, making it the correct length in this context.