Hello there, i thought this may be interesting to you. Smithsonian institute has released its collection of images to download free of charge under creative common zero license, although it’s mentioned
that ( Till now, these images were provided only upon requests for limited usage). The Smithaonian
huge American collection ranges from history, culture
to art and science.
[https://thenextweb.com/apps/2020/02/26/smithsonian-institute-just-released-2-8-million-high-quality-images-for-free/]
You can view the collection of 2.8 million images here:
4 Likes
WOW! Awesome Yasser! Thank you for the share!!! 
1 Like