Borgholm Castle I
Borgholm Castle was built in the 1200s and, being a fortress, protected Sweden during several wars. I won't account for its rich historical background here, since it would require a lot more than a couple of sentences. Just read up on it yourself in case of interest. However, I will tell you that the castle is located on Öland, one of those two small islands next to Sweden's mainland. I had never been there before, so it was a new experience.