If there is a city one must visit, Lisbon is one of them. During a short visit there recently, we run into Peter Coville by chance. He is a former philosophy teacher from England, living in Lisbon and runs walking tours of Lisbon every morning. He gave us a small taste of the city and its history. 

If you ever get there and need a guide who knows a lot about the city of Lisbon he is definitely your man.