Like others, I think the most beautiful country I've ever been in is my own, Norway .. The most beautiful place I think was Geirangerfjorden, one of the fjords on the west coast. It's such an old and worn down country and down in the fjords, you get warm summer temperatures as the cliffsides are warmed up by the sun while at the mountaintops surrounding the fjords, you have snow year round. Beautiful!
The most beautiful place I've lived myself was up on Svalbard of course. The nicest place I've been to up there is Kongsfjorden, another fjord (we have a lot of them here) which has several large glaciers calving ice into it so you get lots of sea ice there. In summer, they melt until they often end up looking like sculptures bobbing in the quiet arctic water. I used to have a lot of pictures from it, but the computer harddrive they were on completely broke down and I lost all of them.
Instead, here's a bird cliff where I've done some fieldwork!