This place is built on the site of Stadium of Domitian that was built in the first century AD. During the Ancient times, Romans used to come here and watch games or agones. The name has undergone certain changes from then on. It went from agones to navone and then finally navona. It happens to be the most popular and the largest city square in Rome. You will have loads of cafes around the place so what you do is, get a coffee on a cold day, sit nearby and observe life. Sounds boring? It isn’t, try it sometime.