Juan Quintana
A defensive wall
The Antonine Wall was built in 140 AD during the reign of Antoninus Pius, as a northern defense much like the more famous Hadrian's Wall to the south. It was a lot lower than Hadrian's Wall, and surrounded by ditches or dikes. The most obvious archaeological evidence of the wall is found in the Watling Lodge area of Falkirk, but there are no visible remains of the wall itself. However, excavations are ongoing. It should have happened long ago, but hey, better late than never!
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