I always wonder about sounthern europe during the medieval Period,how are they different from northern europe architecture wise.also what matereal do common people use to make their homes in medieval southern europe, was it the same in northern europe?
Southern Europe is a big place, and the Medieval Period is a long time; this question is nearly impossible to answer. You might be interested in these posts of mine dealing with Italy to get you started, although areas like Spain, Greece, and Southern France (which I don't wrote about) would be equally interesting.
The importance of the "King of Italy" through history
A post about Italian Gothic Architecture (although many of the links don't work anymore)
Middle class housing in medieval Italy
Security and conflict resolution in early medieval Venice
The breakdown of the early Kingdom of Italy
The Kingdom of Italy as part of the Holy Roman Empire
I want to hear your thoughts around this.