For me Magnum had some fantastic covers:
OK It's like a rip off LOTR but it's such an intimate and warm cover with the browns and oranges.
I like the composition here. There are 3 things vying for your attention yet nothing detracts from another and that city just looks so magical and elusive.
This is the full cover from Magnum's Mirador. The relative lack of colour works brilliantly here and is seemingly simple yet looking closer it is incredibly layered.