erfurt cathedral and severikirche, st severus's church from the petersberg citadel, erfurt in thuringia, germany

erfurt germany cathedral domberg severi severikirche cityscape citadel petersberg fortress bridge thuringia bastion architecture city town landmark travel historic middle ages gera tourist german medieval trade capital history heritage church street building sky scenery domplatz panorama center monument outdoors downtown tower gothic skyline square religion europe market severus's largest