Aalborghus Castle is a half-timbered fortress in Aalborg built by King Christian III between 1539 and 1555, originally serving as a royal fortification and later as a provincial governor's seat. The castle is the only remaining half-timbered castle of its kind in Denmark, featuring a low, practical Renaissance design set in leafy grounds near the harbour. Visitors can freely explore the cobbled courtyard, grassy ramparts, and tranquil park, with atmospheric dungeons and casemates accessible during summer months. Local legend adds mystique, with tales of the White Lady haunting the castle's depths.