The whole city of Southampton contains a wealth of archaeological remains, both on dry land and underwater. Below the modern streets can be found evidence of prehistoric hunter-gatherer and farming communities, the Roman settlement of Clausentum, the middle Saxon town of Hamwic, and the late Saxon and medieval town and villages that laid the basis for the modern city and suburbs. Some ancient walls and buildings still survive above ground. The complex picture is constantly being amended and enhanced by archaeological fieldwork.
You can find out more about the archaeology service here.