It is hard to separate location from hotel. Some hotels have a great location because they are central and close to amazing sights, but if I were to talk about amazing locations because of view or nature etc. my favourites would be:
Amangiri (everything!!)
FS Seychelles (that view!!!)
Aman Sveti Stefan (unique location)
FS Hong Kong (view)
FS Istanbul at the Bosphorus (by the river)
Amanpulo (beach)
Rayavadee (beach - before and after hordes of tourists have left)