Ahlden castle was built between 1579 and 1698, combining elements of the Renaissance and the Baroque. In 1694 Princess Sophie Dorothea of Brunswick-Lüneburg was exiled to the castle by her husband Georg Ludwig of Hanover, who later became King George I. of Great Britain. During the 19th century until 1972 the castle served as a district court. In 1975 the art dealers Florian and Karin Seidel bought the castle and restored it. The first auction took place that same year. In 2018 the castle was sold to the art historian Daniel and Magdalena Cremene who continue to run the auction house and open the castle for cultural events and tourism.