Spa of Belgium is not the only place in the world that has famous healing mineral springs, however, it provided a generic name for any place of this kind. Its fame was ever growing from as early as 14th century. Besides being just pretty Walloon town, Spa attracts gamblers to its casinos, as well as Formula One fans who come to watch Belgian Grand Prix at nearby Circuit de Spa-Francorchamps. As a nice finishing touch, let us not forget that Spa is a hometown of Agatha Christie's fictional character, Hercules Poirot.