This river island is dominated by the monumental, double-towered Poznań Cathedral , originally built in 968. The Byzantine-style Golden Chapel (1841) and the mausoleums of Mieszko I and Boleslaus the Brave are behind the high altar. Opposite the cathedral is the 15th-century Gothic Church of the Virgin Mary . The island is 1km east of the Old Town (take any eastbound tram from Plac Wielkopolski).