Generally speaking, translate the names of museums, but refer to them on subsequent mention by their abbreviation if they have one: for example, the National Art Museum of Catalonia (MNAC).
Recommended citation:
«Museums» [en línia]. A: Llibre d’estil de la Universitat de Barcelona. Barcelona: Universitat de Barcelona. Serveis Lingüístics. <https://www.ub.edu/llibre-estil/criteri.php?id=2456> [consulta: 21 novembre 2024].