A section of Hadrian's Wall exists at Heddon-on-the-Wall. The wall would have stood 4.5 meters high and had a ditch on the northern side for extra defense against people outside of the Roman empire borders. The section of wall here is three meters wide, so it is an earlier part of the wall. After the wall was built here, the standards were changed to narrow the wall to just under two meters wide.
This is not a long stretch of wall, but it is a pleasant stretch to walk along.
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