Sasha Trubetskoy did not set out to create an underground map-style of the Roman roads of Britain�"not specifically. He had seen plenty of fantasy transit maps online and, he says, “I figured I could do better.� He just needed a subject, and he landed on ancient Rome, which no one had tackled before, despite its extensive network of roads across its vast empire.

https://www.atlasobscura.com/articles/roman-road-subway-map-underground-londinium

Attribution: Sasha Trubetskoy

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