Daggerfall is a must!!! You'll get to see how it shaped Bethesda and the Elder Scrolls games that came after (including Morrowind)
[1] https://store.steampowered.com/app/1812390/The_Elder_Scrolls...
[2] https://www.dfworkshop.net/daggerfall-unity-1-0-release/
I had a similar moment in my life when my daughter asked me about D&D late 2010s. They’re grown now but boy did I bombard them with nerddom.
I recall looking over the shoulder of my friend who was playing it religiously and seeing all those dots on the continent map, asking my him if those are all navigable locations, to which he replied: "yeah, I haven't even visited all of them yet".