From January 2016 the New York Public library provides enhanced public domain access to its online collections which include thousands of stunning historical images. See this announcing blog post which has lists of possible uses: these include usage of bulk API data.
A great example is this 5th Avenue now and then which compares 1911 with 2015 Google street views.
The Green Book is a shocking example of racial segregation shown in maps between 1936-1944: it listed hotels restaurants and other public buildings where black travellers were welcome.
The site also has many subject based collections – including Gay and lesbian history, posters of the Russian Civil War and fashion illustrations and advertising.
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