Stock Photo - 'Otto Lilienthal' is written on the base of a globe on Fliegeberg hill in the Lilienthalpark in the district of Lichterfelde in Berlin, Germany, 26 June 2017. The monument remembers aviation pioneer Otto Lilienthal. Lilienthal constructed the twelve-meter high hill himself and used it for his gliding attempts. Photo: Paul Zinken/dpa. - Berlin/Berlin/Germany

Stock Photo: 'Otto Lilienthal' is written on the base of a globe on Fliegeberg hill in the Lilienthalpark in the district of Lichterfelde in Berlin, Germany, 26 June 2017.

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