Subway-style maps of roads of the Roman Empire
Fun fact about Roman roads: The Romans would build roads as straight as physically possible. Unlike the modern day, where we will wrap a road around the landscape to keep it relatively level, the Romans would direct their roads straight up and down hills to keep them as short as possible.<p>Also, on the subject of maps of Rome that look like subway maps, the Peutingeriana <a href="https://en.wikipedia.org/wiki/Tabula_Peutingeriana" rel="nofollow">https://en.wikipedia.org/wiki/Tabula_Peutingeriana</a> is supposedly based on a Roman original and definitely feels like a subway map, prioritizing the connections between cities rather than their correct spatial distribution.