For some reason I found this theme to be a bit of a challenge, so I'm really interested to see what the rest of you have found. I saw many landscapes, but the theme of the stamps was often something else and the landscape was incidental. (I know, I could interpret the theme broadly...)My profile states that I prefer mountains over beaches, and these mountains and rolling hills would set my heart a-flutter were I to find myself somewhere in the vicinity.
And over in Lithuania, their 2012 Europa stamp for the theme of visit and a 2009 stamp for preserve the polar regions and glaciers. Not sure where either of these are, specifically.
But, further south Germany issued a stamp in 2013 of the Berchtesgaden Alps located in Bavaria and Salzburg