What are the key things to make sure you check out in Aarhus? Denmark’s second city is home some of its best attractions, from a glorious open-air old town museum through to the finest collection of old posters we’ve seen in donkeys years, which is to say for quite a while. This is your sightseeing must-dos, the sights and sounds that absolutely must sit top of your list. If you don’t see these spots, did you even go to Aarhus at all?