Located on the shore of Lake Mälaren, Gripsholm Castle is one of the most beautiful in Sweden. It was the castle of Gustav Vasa, and was originally commissioned way back in 1537. Apart from its grand design, the castle is also well known for its huge collection of portrait paintings. These portraits are predominantly of the royal family, but also include images of celebrities from Sweden’s history, with even modern faces like ABBA making an appearance. There is also a deer park in the grounds of the castle which you can walk around.