In 2023, the FHXB Museum obtained a collection of over 5,600 historical postcards from the estate of Peter Plewka. These maps show Kreuzberg between 1890 and 1945 and document streets, squares and everyday scenes.

The digital exhibition invites visitors to explore the postcards thematically. The archive also offers visitors the opportunity to pose their own questions to the collection and reinterpret the past.