The Commons on Flickr is a website and program “to increase access to publicly-held photography collections” and “to provide a way for the general public to contribute information and knowledge” by adding tags or comments to help describe the photographs. The Library of Congress, the Smithsonian, the New York Public Library, and the National Galleries of Scotland are just a few of the participating institutions.
Here’s a photo from the State Library of New South Wales of Adelie penguins after a blizzard at Cape Denison, taken by Frank Hurley during the First Australasian Antarctic Expedition, 1911-1914:
Here’s an 1882 albumen print of Oscar Wilde from the George Eastman House Collection:
Thanks to LISNews for the tip.