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Volunteered Geographic Information projects like OpenStreetMap which allowaccessing and using the raw data, are a treasure trove for investigations -e.g. cultural topics, urban planning, or accessibility of services. Among theconcerns are the reliability and accurateness of the data. While it was foundthat for mainstream topics, like roads or museums, the data completeness andaccuracy is very high, especially in the western world, this is not clear forniche topics. Furthermore, many of the analyses are almost one decade old inwhich the OpenStreetMap-database grew to over nine billion elements.  Based on OpenStreetMap-data of wayside crosses and other cross-like objectsregional cultural differences and prevalence of the types within Europe,Germany and Bavaria are investigated. For Bavaria, internally and by comparingto an official dataset and other proxies the data completeness, logicalconsistency, positional, temporal, and thematic accuracy is assessed.Subsequently, the usability for the specific case and to generalize for the useof OpenStreetMap data for niche topics.  It is estimated that about one sixth to one third of the crosses locatedwithin Bavaria are recorded in the database and positional accuracy is betterthan 50 metres in most cases. In addition, linguistic features of theinscriptions, the usage of building materials, dates of erection and otherdetails deducible from the dataset are discussed. It is found that data qualityand coverage for niche topics exceeds expectations but varies strongly byregion and should not be trusted without thorough dissection of the dataset.

Data coverage, richness, and quality of OpenStreetMap for special interest tags: wayside crosses -- a case study