Is there a way to see champion details from before they were reworked?

So I was wondering if there's like a website or something that you can use to check out what a champion was like before they got reworked or updated, like their old abilities, stats, and whatnot. I'm curious because I've never seen the old Sion and forgot what champs like Gangplank, Darius, and Fiora were like before their reworks, and I think it'd be interesting to look at what champions used to be