The reason is not the music, food or tourism. Some time ago, I grabbed a copy of Leroy-Beaulieu's De la colonisation chez les peuples modernes (1874) . It seems that he created the concept of "colonies of settlement" and "colonies of exploitation" (Roscher may have said something similar. I bought his book, but I gave up learning German 20 years ago). Every schoolboy in Brazil learns the diference between exploitation and settlement colonies thanks to Caio Prado Jr, a marxist historian. One day, I may write about the intelectual evolution of these concepts. A possible title of the paper: "From Roscher to Acemoglu"...Would anyone like to participate in this project?
(There was another reason to learn Frech: reading Thisse et al. textbook on Regional Economics, but I've just found out that it has been published in English as well. )