Where are these photos on google that are taking all of my space?

My google drive says I have 13G of space used by photos. Please read what I've done, and why I'm lost for answers. I have zero photos on google. I have no phone apps or anything else. When I go to photos there are no photos showing. I've tried the recover the space by compression, but after a few hours it never works. I go back and it still shows 13G used. I have done away with cookies and session info in order to avoid stale data. It still won't work. I've tried from different browsers and nothing. I did a few months ago click the download on a few large videos from a google plus account, and I received a notice that space was used up. Problem is, where are these videos or whatever it is. If I can't find them, I can't remove them.