incredible." At that time, more than 375,000 photographic images from the museum's archival collection were released for public domain reproduction and use both by the general public and by large public access websites such as those available at Google BigQuery. In May 2022, the Met and the World Monuments Fund announced a collaboration of digital work for the 2024 reopening of the African, ancient American, and Oceanic art galleries. The digital project "aims to bolster the understanding of several historic sites in sub-Saharan Africa," in particular sites that have been minimally explored by Western museums. Open access images and data have been viewed over 1.2 billion times with over 7 million downloads. Libraries Each Department maintains a library, most of the material of which can be requested online through the libraries' catalog. Two of the libraries may be accessed without an appointment: Thomas J. Watson Library The Thomas J. Watson Library is the central library of The Metropolitan Museum of Art, and supports the activities of staff and researchers. Watson Library's collection contains approximately 900,000 volumes, including monographs and exhibition catalogs; over 11,000 periodical titles; and more than 125,000 auction and sale catalogs. The library includes a reference collection, auction and sale catalogs, a rare book collection, manuscript items, and vertical file collections. The library is accessible to anyone 18 years of age or older simply by registering online and providing a valid photo ID. Nolen Library The Nolen Library is open to the general public. The collection of some 8,000 items, arranged in open shelves, includes books, picture books, DVDs, and videos. The Nolen Library includes a children's reading room and materials for teachers. Special exhibitions The museum regularly hosts notable special exhibitions, often focusing on the works of one artist that have been loaned out from a variety of other museums and sources for the duration of the exhibition. These exhibitions are part of the attraction that draw people both within and outside Manhattan to explore the Met. Such exhibitions include displays especially designed for the Costume Institute, paintings from artists from across the world, works of art related to specific art movements, and collections of historical artifacts. Exhibitions are commonly located within their specific departments, ranging from American decorative arts, arms and armor, drawings and prints, Egyptian art, Medieval art, musical instruments, and photographs. Typical exhibitions run for months at a time and are open to the