Wanda von Schönaich was the mother of one of the castle's owners and a mausoleum dedicated to her was built at the beginning of the 20th century. In 1907 the remains of the late Lady Wanda Henckel von Donnersmarck, the mother of Carl von Schönaich, the Siedlisko's owner at that time, were buried in the mausoleum. It is one of the few mausoleums of noble families.