Smithsonian Open Access
Smithsonian Open Access makes millions of digital items from across the Smithsonian's museums, research centres, and archives available for anyone to use. The collection spans images, 3D models, and research datasets drawn from one of the largest cultural and scientific institutions in the world.
Everything in the programme is released under CC0, which places the material in the public domain and lets you copy, adapt, and reuse it for any purpose, including commercial work, with no attribution required. That makes it one of the cleaner cultural heritage sources to build on.
For RAG, the descriptive metadata and research datasets give you well-organised, reusable content about objects, specimens, and artworks, with none of the licensing caveats that usually come with heritage collections.
Related sources
Common European Data Space for Cultural Heritage
The umbrella project coordinating cultural heritage data across Europe. Led by the Europeana Initiative, it helps cultural institutions and EU Member States share their collections through a common, shared infrastructure.
Digital Public Library of America (DPLA)
An aggregator that brings together content from America's museums, libraries, and archives. Its API offers metadata on individual items and on collections, and the whole repository is available to download as zipped JSON files.
Europeana
A platform for discovering cultural heritage collections across Europe, with multilingual access to over 60 million digitised items from around 4,000 institutions, including books, paintings, maps, manuscripts, and audiovisual and 3D media.
HathiTrust Digital Library
A partnership of academic and research institutions offering millions of digitised titles. Its Research Center provides computational access to the full corpus, including in-copyright works, under non-consumptive research terms.