A row of Poplar trees (Populus) is creating long shadows on a green field, Königstein, Saxony, Germany, Europe

A row of Poplar trees (Populus) is creating long shadows on a green field, Königstein, Saxony, Germany, Europe

The fortress Festung Königstein is sticking out of fog in the valley of the river Elbe, Elbsandsteingebirge, seen across a grain field, Königstein, Saxony, Germany, Europe

Thick fog is filling the valley of the river Elbe in Elbsandsteingebirge, seen from Lilienstein at sunrise, Königstein, Saxony, Germany, Europe

Thick fog is filling the valley of the river Elbe in Elbsandsteingebirge, seen from Lilienstein at sunrise, Königstein, Saxony, Germany, Europe

Thick fog is filling the valley of the river Elbe in Elbsandsteingebirge, seen from Lilienstein at sunrise, Königstein, Saxony, Germany, Europe

Fog is arising over the hills of Elbsandsteingebirge, seen from Lilienstein in the last light of the day, Königstein, Saxony, Germany, Europe

Aerial view of Burg Rheinstein, Trechtingshausen, Unesco World Heritage Site Upper Middle Rhine Valley, Rhineland-Palatinate, Germany, Europe

Aerial view of Burg Rheinstein, Trechtingshausen, Unesco World Heritage Site Upper Middle Rhine Valley, Rhineland-Palatinate, Germany, Europe

Burg Bentheim, Powder Tower, Bad Bentheim, Lower Saxony, Germany, Europe

Rheinfels Castle, Rhein, Rhine Valley, UNESCO World Heritage Site, in Sankt Goar, Rhine Valley, Rhineland-Palatinate, Germany, Europe

Aerial view, Konigstein fortress, monument, Konigstein, Saxony, Germany, Europe