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The City of London was once surrounded by a defensive wall, originally built by the Romans and enlarged in the middle ages.
It was served by several gates, whose names are still in evidence today.
Editor-at-Large of Londonist Matt Brown takes us on a tour around the sites of these gates, and looks for the clues that remain.
Let us know in the comments what Beatles song you think we're referring to!
Also have a read of 'Where to see Roman London':