The Abbyy can be visited
Essen Abbey

Essen Minster, also known as Essen Cathedral, is the bishop's church of the Diocese of Essen and an example of Gothic architecture in North Rhine-Westphalia. It is located on Burgplatz in Essen's city center and houses the Golden Madonna, one of the oldest fully sculptural figures of Mary north of the Alps.
History+
The history of Essen Minster dates back to the 9th century, when Bishop Altfrid of Hildesheim founded a women's collegiate church around 845, around which the city of Essen developed. The first church on this site, a three-aisled basilica, was built between 845 and 870 and damaged by fire in 946. A reconstruction took place between 960 and 964, which included an outer crypt and a westwork under Abbesses Agana and Hathwig.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Essen_2011_66-2.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: 51.4559, 7.0139