Digital Public Library of America
From the site: "DPLA connects people to the riches held within America’s libraries, archives, museums, and other cultural heritage institutions. All of the materials found through DPLA—photographs, books, maps, news footage, oral histories, personal letters, museum objects, artwork, government documents, and so much more—are free and immediately available in digital format. The cultural institutions participating in DPLA represent the richness and diversity of America itself, from the smallest local history museum to our nation’s largest cultural institutions. Our core work includes bringing new collections and partners into DPLA, building our technology, and managing projects that further our mission through curation, education, and community building."