Search Flickr for images with Creative Commons licenses. Always check the terms of the CC license to determine how an image can be used. View CC licenses here.
More than 50 million embeddable images, that you can embed on a website, social media site or blog for free and without having to buy a license, as long as the photo is not used for commercial purposes.
The collections of the Prints & Photographs Division include photographs, fine and popular prints and drawings, posters, and architectural and engineering drawings. Determine use and copyright restrictions before using images from this collection.