We wound our way through a few dozen hairpin curves in the mountains of southern Germany, and Ms Garmin showed a lake ahead, around one last corner and there it was, glimmering like a diamond. The caribbean blue seeming oddly out of place in the mountains. The German Alpine Road ran along the shore, parks, beaches, and boat houses between the road and the lake. Wow what colors. The road rambled around several lakes, but only one had this magic color.