In the 10th century the Wend built on a sand-island on the western bank of the Spree river a Slavonian castle barrier, the largest Slavonian castle of Lower Lusatia and today's "Schlossberg". Here the 46 m high medieval castle tower rises which got in 1877 a merlon crown and a neo-Gothic tower cover. Also the court of justice was established then. The small waterfall at the "Schlossberg" is worth seeing.