Fallout: New Vegas.

I spent many hours wandering the desert, being a completionist 100%ing all of the side quests I could find, finding all the stables, comparing lore and storylines with FoE, exploring, meeting people and comparing the geology to maps I looked up. Fabulous game, and I had a great time. I just never went into Vegas. I’ve honestly been considering another play through, but I will probably skip Vegas again out of principle.