This summer is not only the longest and warmest since I have been in Denmark, it’s also the longest and warmest on record. We have had weeks and weeks of temperatures hovering around 30°C. Like in Southern Europe, many people choose to stay inside away from the scorching heat during the daytime. However, I choose to explore whenever I get the chance. This weekend my friends told me about the Viking Festival at Trelleborg Castle, the best preserved of the seven known Viking ring castles in Denmark.