1. FFX - It's just so beautiful, Macalania Woods is surely one of my favorite video game place ever.
2. FFIV - It's really medieval and I love it, and there's not only one important kingdom, it's really well done.
3. FFVI - I just love the atmosphere of this game so much, in both world of balance and world of ruins.
4. FFXV - It's modern, but again, it's another world I find really beautiful, particularly Altissia and Galdin Quay.
5. FFIX - Another medieval setting, and I really like!