The Arch of Constantine

I read documents / articles, and watch documentaries on history quite a bit. So was thrilled to find this channel where history professors show / describe answers to questions I always had... 

For example, my husband and I spent quite a long time trying to figure out the arch of Constantine, a prominent beautiful building in the centre of Rome. It had roughly done figures in the centre, and beautifully sculpted figures on top. Why was there so much difference in style ? 

It must have been important for the time, as it was built on the procession way, where emperor's walked in triumph. It was evidently a lot about war, but what was it saying ?

But the professors explain it beautifully here... 

Ancient Rome is worth understanding a bit, as along with Ancient Greece, whose successor it was, it laid the foundation of modern Europe - and the English speaking world, along with it. Its laws, infrastructure concepts, public institutions like the judiciary and parliament, even architecture styles are the bedrock of these societies to this day. 

Every successful nation in the West to this day, aims to be the Roman empire all over again. It is then worth it to understand Ancient Rome's achievements, but also its vanities and corruptions.