Overlooking the west bank of the Rhine just north of the city centre is the Apollinariskirche. It has an observation deck that is only open to parishioners on Sundays. Pedestrians reach the church via a dirt trail that passes a series of roadside monuments representing each of the fourteen Stations of the Cross. The church grounds contain an outdoor crypt and an abbey. Further down the river is one of the many castles along the Rhine, perched even higher than the Apollinariskirche.