Saint Justin's Church, Frankfurt-Höchst
East Höchst, Germany · built 850
The Carolingian Saint Justin's Church in Frankfurt-Höchst is the oldest building in Frankfurt/Main and one of the oldest churches still existing in Germany. It is dedicated to Saint Justin the Confessor. The Catholic basilica originates from around 830, and the late gothic chancel was built from 1441. The church stands at the east of the old part of the town Höchst, looking over the Main river. St. Justin's is important both for its stonework (the Carolingian capitals and the late gothic north doorway), and that it is one of the few nearly completely surviving early medieval churches - which has been continuously used for around 1200 years.
Church data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).