Planetrees Roman Wall
Chollerford, Northumberland, UK
Hadrian's Wall was originally built to a 3-metre wide design; subsequently changed to 2-metre wide in the interests of speed of construction, and presumably to save money. At Planetrees you have a section of "narrow" (2 metre) wall that can be seen standing on "broad" (3 metre) foundations. This is one of the easternmost parts of the Wall still standing, and lies on Hadrian's Way National Trail.
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