Did you know, that OpenStreetMap and Wikimedia (Commons, Wikipedia, Wikidata, ...) work together? As you might know there are ways to link OpenStreetMap objects to Wikimedia objects (preferably with the wikidata tag, but wikipedia, image and wikimedia_commons are also ways to achieve that). OpenStreetBrowser integrates this and shows images and excerpts of Wikipedia articles in object details.
Recently, I blogged about mapping artwork and memorials with Wikimedia integration on the OpenStreetMap blog. I hope this motivates people, to add more Wikimedia links (and artwork, memorials and pictures thereof)!