Wikimuseum is an experimental curatorial concept developed with Wikimedia Eesti and Wikimedia Hungary, creating multilingual, co-curated exhibitions across Wikimedia Commons, Wikidata, and Wikipedia. It brings together dispersed cultural heritage—often never seen together physically—into structured digital exhibitions that connect institutional collections, private archives, and community knowledge. The project explores how open platforms can support collaboration between museums, researchers, and source communities, while addressing legal, ethical, and data governance challenges.