Kalmar Castle, in Sweden, is tranquil now, and murmuring tourists make the only sounds on cobblestones that rang with horses' hooves and marching feet 800 years ago. The mighty fortress, where swords clashed in bloody battles, was replaced with a castle in the 16th century by King Gustav Vasa. This is one of Sweden's best-preserved Renaissance castles, complete with moats, dungeons, and secret ... Read Full Article