In North Friesland is the castle outside Husum, which was originally built as a secondary residence of the ducal house of Schleswig-Holstein-Gottorf. The name of the castle comes from the fact that at the time of its construction it was located outside the city limits of Husum. In the 18th and 19th centuries it then became a royal castle, as the Danish royal family occasionally used the castle outside Husum as a residence. Today, the building is considered the only preserved castle on the west coast of Schleswig-Holstein and is home to the castle museum and a cultural centre, among other things. Husum Castle and the castle park are a popular destination for excursions, attracting many visitors especially during the annual crocus blossom.