Would like some advice on places to see/things to do within the following:
I appreciate some of the places listed have obvious sites, which I'll do, but any fairly unknown areas etc I could see...
Brussels - Berlin - Lisbon - Milan - Rome - Naples - Cannes/Nice/Monaco - Paris - Porto - San Sebastian/Bilbao - Madrid - Barcelona - Zurich - Hamburg
Thank you all in advance!!
What should I do?