Skokloster Slott, around 11km due northwest of Sigtuna (26km by road), is a whitewashed baroque palace with a fragile beauty unusual in Sweden. It was built between 1654 and 1671 and has impressive stucco ceilings and collections of furniture, textiles, art and arms. There’s also a small cafe. Guided tours run daily from April to October (Skr40); it’s a good idea to call in advance to check times, as the schedule can change.