This masterpiece of medieval architecture dates to 1270 and is modelled on Lübeck's Marienkirche. Its interior is awash with colour and is filled with art treasures. The main altar (1708), designed by the baroque master Andreas Schlüter, shows the eye of God flanked by cherubs and capped by a depiction of the Last Supper. The main portal of is reached via an entrance off the Alter Markt.
Also worth a closer look are the sculpturally rich rich high altar (1470), 6.7m wide and 4.2m tall, showing Jesus' entire life, and, behind the altar, a 1394-built (but no longer operational) astronomical clock.