Borbach, frozen over in winter, Witten, Ruhr Area, North Rhine-Westphalia, Germany, Europe

The Institute for Waldorf Education in Witten, Ruhr Area, North Rhine-Westphalia, Germany, Europe

Hardenstein Castle Ruin on the Ruhr in Autumn, Witten, Ruhr Area, North Rhine-Westphalia, Germany, Europe

University of Witten/Herdecke, first German private university, Witten, Ruhr area, North Rhine-Westphalia, Germany, Europe

University of Witten/Herdecke, first German private university, Witten, Ruhr area, North Rhine-Westphalia, Germany, Europe

Two overhead line pylons and a wind turbine in front of the sun, Witten, Ruhr area, North Rhine-Westphalia, Germany, Europe

"Aerial view, Ruhrtalbrucke bridge, A52 motorway, Ruhr river, Ruhrtal, Ruhr Valley, between Mulheim and Essen, Ruhr Area, North Rhine-Westphalia, Germany, Europe"

"Child's hands holding an electronic component with light emitting diodes, IdeenPark 2012, technology and education summit conference for young people, Essen, Ruhr area, North Rhine-Westphalia, Germany, Europe"

"Aerial view, Ruhr viaduct with excursion boat, Ruhr valley, Ruhr, Herdecke, Ruhr district, North Rhine-Westphalia, Germany, Europe"

"Aerial view, pumped storage plant Koepchenwerk on Hengsteysee lake, Ruhr valley, Ruhr, Herdecke, Ruhr district, North Rhine-Westphalia, Germany, Europe"

Ruhr valley, Hengsteysee, Volme estuary, Hagen, Ruhr area, North Rhine-Westphalia, Germany, Europe

"Movable hand of RoboThesbian, a humanoid robot by Engineered Arts, Ideenpark 2012, Essen, Ruhr area, North Rhine-Westphalia, Germany, Europe"

Heisingen in the Ruhrbogen, Ruhr valley, Essen, Ruhr area, North Rhine-Westphalia, Germany, Europe

"Aerial view, Laufwasserkraftwerk Hengstey hydroelectric power station on the Ruhr river, Ruhr Valley, Herdecke, Ruhr district, North Rhine-Westphalia, Germany, Europe"

"Aerial view, algae growth at the tip of a land tongue with sheep, pedalos, Kemnader See, lake and reservoir, Witten, Ruhr Area, North Rhine-Westphalia, Germany, Europe"

Ruhrhalbinsel Überruhr, Ruhrbogen, Ruhr valley, Ruhr, Essen, Ruhr area, North Rhine-Westphalia, Germany, Europe

"Child's hands using pliers on an electronic component with light emitting diodes, IdeenPark 2012, technology and education summit conference for young people, Essen, Ruhr area, North Rhine-Westphalia, Germany, Europe"

Aerial view, industrial district, German Edelstahlwerke GmbH, steelworks, Ruhr Valley, Witten, North Rhine-Westphalia, Germany, Europe

Hands holding tablet pc, with photo of Ruhr valley, Witten, Ruhr area, North Rhine-Westphalia, Germany, Europe