I remember that Daggerfall was released just before my birthday in September 1996, and I was still playing it over a year later, having completely missed all the fuss about Diablo (which came out at the end of 1996). Daggerfall was one of the first successful 3D first person sandbox RPGs with a huge game world, massive random-generated dungeons, huge populated towns, and an involving back story (told mostly through the books that you find). It was the first RPG game I played that did not railroad you down the main quest line, in fact I don’t think I even did the main quest until a second visit to the game some years later.
It’s worth a look at where Morrowind and Oblivion came from, and if you enjoyed Morrowind you’ll likely enjoy Daggerfall as well (bear in mind the 15 year old game engine tech though). You’ll need to run it under DOSBox, but Bethesda have provided full install instructions to get you up and running quickly.