It is critical to make sure you have permission to use the images, documents, and objects in your exhibit.
Even when you are using them for educational purposes, publishing images to the web for which you do not have permission does not constitute "fair use."
Regardless of where you find items that you want to include in your exhibit, make sure they are available for reuse before including them on a website.
Over 16 million freely usable media files. Like Wikipedia, anyone can contribute to the collection. Copyright and licensing information is provided for every image.
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A large collections with artworks, artifacts, books, videos and sounds from across Europe. Has filters for Open Licenses.