I'll be adding in more websites here...but this is a professional-grade photography website, specializing in Catholic images.
Beautiful Free Catholic Images & Pictures | Cathopic
Here's some more from a public-domain site:
https://www.pexels.com/collections/the-beautiful-catholic-faith-pwnjx13/
Beautiful Free Catholic Images & Pictures | Cathopic
Here's some more from a public-domain site:
https://www.pexels.com/collections/the-beautiful-catholic-faith-pwnjx13/