One stamp is this:
Ancient Beech Forests of Germany (issued 02-01-2014)
In 2011 the Primeval Beech Forests of the Carpathians in Slovakia and the Ukraine were extended. Since then the Ancient Beech Forests of Germany are also a UNESCO World Heritage Site. The Ancient Beech Forests of Germany are forests in the nationalparks Hainich in Thuringia, Kellerwald-Edersee
in Hessen, Jasmund und Müritz in Mecklenburg-Vorpommern and the woodland Grumsin in the Biosphere reserve Schorfheide-Chorin in Brandenburg.