To visit a foreign city seems easier than ever nowadays. A spontaneous weekend trip to Copenhagen, Barcelona or Amsterdam is nothing unusual. Guide books and smartphones make it so easy for us to visit a city that it is not even necessary to ask someone for directions. But how do you really get to know a city ? And what constitutes a city? A clear definition can not exist due to large differences in the cultural, social and economic areas of the earth.
The vast majority of large cities...