In Rome my Profesore gave us two days of the most intense walking tour of my life. Tuscany is cool and breezy and hot but not that hot. Rome is further south, and much much hotter than what I've gotten used to. So imagine walking intensely around August in Toronto for 6 hours straight. And I had two days of it. My Prof is a machine.
Rome is so old, and quite different from any other city I've ever been to. First off, it has so much ancient history which alters the vibe of the city. Rome was the capital of the Holy Roman Empire, and then when it collasped it was the home of the Pope which essentially meant the political center of Italy. There was a period when the Pope didn't live here and the city basically shut down. It doesn't make anything, nor was it known for its banking like Florence, nor was it a port like Venice or Pisa...without the politically and religious stuff, it was nothing. Eventually the Pope came back and now it's the capital. Quite urban.
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Looks like it's about 60m long right? It's only 3m. It's mathematically created to give the illusion of depth and length. Insane. People did incredible things without digital entertainment.
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Ancient ruins.