The Alps, Italy, Western Dolomites.
The "Dolomitenhöhenweg 2", transverses different groups, "Puez/Geisler", "Sella" "Marmolada" and this picture in the "Pale di San Martino", in the east of San Martino di Castrozza.
In the east of this group is a plateau, in the north, west and south are impressive peaks with very intersting climbs, but you can hike just in this group for a week too.
Info about this group in Italian with all the huts
http://www.veramontagna.it/Trentino/- Primiero-San-Martino-di-Castrozza/Gruppo- _Pale_San_Martino
Info about "Dolomitenhöhenwege" or "High-Altitude trails":
http://de.wikipedia.org/wiki/Dolomit- en-H%C3%B6henwege - and some info in English:
http://www.dolomiti-altevie.it/en/

Amazing shots. Where about is this?