For reference, here is a compilation of sources for royalty-free images to use in digital projects (websites, etc.). Some I use often, some are to try.
Please note that some images will have restrictions such as a requirement to attribute the creator, link to a Creative Commons license, etc.
Also See:
Wikimedia Help: Public Domain Image Resources for a mind-boggling list of possible image sources, including many of those below.
General
Internet Archive Book Images (Flickr)
Library and Archives Canada (Flickr)
New York Public Library Digital Collections
Clipart
Diversity, Equity, and Inclusion
(Source: University of Michigan document “DEIJ Open Image Banks“)
The Gender Spectrum Collection
The Noun Project: Redefining Women Icon Collection
Unsplash: AllGo – An App For Plus Size People
Women of Color in Tech (Flickr)
Icons
Maps
Bonus: Toronto Images
Photo: Burgundy Snails by KeldBack on DeviantArt used by Creative Commons license CC BY-NC-ND 3.0 Deed