Medieval castles usually had a moat and Malmöhus castle in Southern Sweden has one too. The castle was originally built in 1434 by Erik of Pomerania, then king of the unified Denmark, Sweden and Norway. On a guide tour I heard the then town antiquarian say that this castle was the king´s favourite castle. Erik was born in Pomerania but his grandmother was sister to the scandinavian Queen Margaret (Margareta). When her own son died Erik took his place as heir the to the crown. Erik was dethroned twice and for a while made a living as a pirate on Gotland. More about his fascinating story on Wikipedia.
The picture above is of an rowboat I discovered in the moat when passing by. The canon tower behind the boat. This picture was originally published on my other blog From My Horizon.