Hadrian's Wall, also called the Roman Wall, Picts' Wall, or Vallum Hadriani in Latin. It was a defensive fortification in the Roman province of Britannia, begun in 122 AD in the reign of the emperor Hadrian.
Small forts called milecastles were established at every Roman mile (the equivalent of .91 modern miles) along the wall, and two observation turrets were placed between each milecastle. Additionally, there were more than a dozen larger forts along the wall’s length where soldiers were stationed. An enormous earthwork consisting of a ditch flanked by parallel mounds, and now referred to as the Vallum, was created just south of the wall.
Hadrian served as emperor from 117 until his death in 138. Afterward, the new emperor, Antoninus Pius, erected a turf wall to the north of Hadrian’s Wall, in present-day Scotland. However, the so-called Antonine Wall, which also had a number of forts along its length, was deserted in the 160s and the Romans reoccupied Hadrian’s Wall. The forts along the wall likely were occupied until the end of Roman rule in Britain, in the early 5th century.
In the ensuing centuries, stones from Hadrian’s Wall were removed to build homes and roads; however, portions of the wall still survive. Today, a long-distance walking path follows the wall’s route across northern England.
Clancy's comment: Back then, people loved building walls. I guess they were the original landscapers?