The Art of Travel is Alain de Botton's travel guide with a difference.Few activities seem to promise us as much happiness as going travelling: taking off for somewhere else, somewhere far from home, a place with more interesting weather, customs and landscapes. But although we are inundated with advice on where to travel to, we seldom ask why we go and how we might become more fulfilled by doing so.With the help of a selection of writers, artists and think