FLICKR IS A GREAT SOURCE OF CREATIVE COMMON IMAGES FOR JUST ABOUT ANY PURPOSE
Flickr is the most popular platform to source free images for websites. It has a library of creative commons pictures from all over the world and from just about any niche. As of this writing, Flickr has a database of more than 220 million images that are licensed under the creative commons license. You can also get archival images on this platform, thanks to the partnership with many public memory institutions across the world, including U.S. National Archives, NASA, National Library of New Zealand. Besides being a photo sharing platform, it allows you to upload, organize, and back up all your images. It also harbors a huge number of amateur and professional photographers that you can engage with.