Lots of cultural heritage institutions have these kind of services for historical pictures, often with very liberal Creative Commons licensing (or Public Domain

Lots of cultural heritage institutions have these kind of services for historical pictures, often with very liberal Creative Commons licensing (or Public Domain). Your own Library of Congress[1] is a fantastic example. In Europe you can get a hint of what's out there via Europeana[2]. Flickr Commons[3] is also a good resource. If you are looking for contemporary pictures, Wikimedia Commons[4] and Flickr[5] is great. When it comes to Unsplash I feel a bit skeptical[6]. I don't share every sentiment expressed in that post, but essentially I think they've stripped away many of the pros that made it a win/win for both photographers and users. I would much recommend trying to establish Wikimedia Commons as a platform. At least it offers a license with attribution as an option for their contributors. [1] https://www.loc.gov/pictures/ https://www.loc.gov/pictures/ [2] http://www.europeana.eu/portal/en http://www.europeana.eu/portal/en [3] https://www.flickr.com/commons https://www.flickr.com/commons [4] https://commons.wikimedia.org/ https://commons.wikimedia.org/ [5] https://www.flickr.com/creativecommons/ https://www.flickr.com/creativecommons/ [6] https://medium.com/@TailsOfWonders/why-unsplash-hurts-photographers-8ddd309a6cd0 https://medium.com/@TailsOfWonders/why-unsplash-hurts-photog...