The Metropolitan Museum of Art in New York is providing 370,000 images as digital files in a CC0 public domain format, which means they can be freely used and edited by anyone without any copyright restrictions. In addition to scanned images, the collection also includes photographs of three-dimensional artworks. The museum is also participating in the Wikipedia Loves Art program, updating its collection information and related interpretive materials on Wikipedia and releasing structured data on Github. It also has partnerships with organizations like ITHAKA-Artstor and Pinterest, as well as other visual image-based communities, to promote the use and exposure of the museum's collection. It seems that in the future, the museum's ticket sales will continue to increase. The link provided is the museum's authorization statement, so be sure to read it before downloading these free images.