The cathedral, also a UNESCO World Heritage Site since 1985, was converted and expanded changed in the 11th, 12th and 14th centuries and rebuilt after its destruction in the fifties. World-famous are the 1000-year-old rose bush at the apse and the masterful Bernwardinian bronze casts: double-winged Erztür (1015) and Christussäule (1020). http://www.hildesheim.de/staticsite/staticsite.php?menuid=167&topmenu=4