Slotsmøllen Sønderborg
The first mill was built in 1791 on land that had been the gardens of Sønderborg Slot, hence the name.
The current Slotsmøllen was built in 1874-75 and is often confused with the famous Dybbøl Mølle, located on Dybbøl Banke on the other side of Als Sund.
The mill is a round gallery Dutch mill. The lower and upper mill are built of whitewashed foundation walls. The cap is boat-shaped and covered with cardboard. The sails are fitted with flaps and the mill turns with a fantail.
Slotsmøllen was built as a grain mill and was powered by wind until 1926, when the cap and windbreak were taken down and sold to Ulbølle Mølle on Sydfyn. The mill then continued to operate for a number of years using motor power. In 1955, Slotsmøllen was taken over by the textile company Møller og Co., which purchased the blades and cap from Bjerreby Mølle on Tåsinge and then used the restored mill as the company's landmark and trademark.
Around 1960, Møller og Co. decided to move out of the city centre and their factory buildings were leased to the new Sønderborg Technical College. In 1964, the school purchased the buildings. It is not immediately clear when Slotsmøllen was transferred to architect Søren Bräuner, but it was sold to Sønderborg Municipality in 1983 and underwent repairs the following year so that the fantail can turn the sails towards the wind.
In 2020-21, Slotsmøllen underwent a thorough restoration by mill builder Møllebygger Petersen from Avnbøl, which included new blades and gallery, and the 14-tonne mill cap is taken down and completely renovated.
It is now owned by Sønderborg Municipality and can only be viewed from the outside.