Apr-Sep: 9am-6pm; Oct and Mar: 9am-5pm; Nov-Feb 9am- 4pm
Nigra gate is the largest Roman edifice on German soil. The gateway (late 2C) was designed for military use to defend the northern ramparts: only the upper storeys are equipped with blind arches. In the 11C the fortified gateway flanked by two towers was transformed into a two-storey church, dedicated to St. Simeon. All that remains today is the apse and the remnants of some Rococo sculptures.