I thought the design of interior in Fallout 3 was pretty cool. You had some subways, you had some utility rooms, bunkers, office buildings, hotels, trainstation, supermarkets, musea, etc.
Infact i absolutely loved Fallout 3's interior or "dungeon" layouts. There was so much variety, it felt so atmospheric to be scrounging through a ruined office building, looking to find something usefull to loot or shoot. And that was part of the strength, the variety in the rooms themselves and always that itch to scratch. Even if a room wasn't part of the X to Y path, it managed to peak my curiosity to take a look around regardless. And my curiosity got rewarded from time to time with great little stories or fun/good rewards.
That was a game that came out after Oblivion and before Skyrim. I don't think Bethesda is going down TES route of "dungeons", they have a different formula for how they do interior zones in the Fallout universe.