The church can be visited
Artländer Cathedral

In Ankum, Lower Saxony, stands the Roman Catholic parish church St. Nikolaus, popularly known as the Artländer Dom. Its appearance shapes the cityscape of the old market town.
History+
The first mention of a church in Ankum dates back to 1169. It is believed that the origins of the parish date back to the Saxon era, possibly as a baptismal church under Charlemagne. An initial wooden church was replaced by a stone structure in the 11th century, which developed into a three-aisled basilica in the 12th and 13th centuries. This complex, once surrounded by a fortified churchyard, underwent expansions.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Artl%C3%A4nder_Dom.jpg
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 52.5427, 7.8699