The 3rd-century AD Newport Arch, Lincoln — the former Roman north gate to the Upper City, said to be oldest arch in the UK still used by traffic.pic.twitter.com/l2M6UqmR7Z
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It's at the end by the Lawn; the structure is covered over now, but you can clearly see where it lies under the grass :)pic.twitter.com/426feIUu0M
And yes, the lower gate is down by County Hall :)
I believe that is the case, in fact! :)
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