The old stock exchange in the renaissance style from the 17^th century is now one of the essential sights of Copenhagen mostly due to the unique design of its roof. The said roof has a big spiral that looks like the horn of a narwhal, reaching 56 meters in height, but actually, the spiral are tails of four dragons intertwined. It is believed that the spiral safeguards the building, and surprisingly, it did not come to harm in the most dangerous situations, so the legend seems to be true.