This paper presents Türkiye's National Museum Information System (MUES), a comprehensive digital platform managing 3.7 million assets in 248 public museums and 286,000 assets in 347 private museums. MUES digitizes the entire heritage lifecycle-from excavation to conservation, exhibition, and storage-standardizing workflows to boost efficiency, cut costs, enhance preservation, and combat loss and illicit trafficking. Compliant with cultural heritage laws and data governance, it offers institutional authorities granular control through a no-code, user-friendly interface, ensuring transparency and accountability. Its modular, interoperable design supports scalable adoption and integration with international heritage platforms. Beyond institutional use, MUES democratizes cultural heritage by providing real-time access to researchers, policymakers, and the public, fostering an inclusive, participatory ecosystem. Aligned with WSIS goals, MUES serves as a sustainable, replicable model for global digital heritage governance and collaboration.