 The most significant event was the signing of the Treaty of Hubertusburg on 21 February 1763 in the castle's White Salon.The highlight of Dahlen is the ruins of the former Dahlen Castle.Built by Heinrich Graf von Bünau (on land left to him by his heiress wife Augusta Helena von Döring who died in 1728) between 1744–1751, the castle was originally one of the residences of the von Bünau family and latterly of the Sahrer von Sahr-Schönberg family which lost all its possessions due to expropriation and banishment without compensation by the post-war communists in 1945.