20140419140252-f3522.jpg Guarding the TunnelVorschaubilderIn the QuarryGuarding the TunnelVorschaubilderIn the QuarryGuarding the TunnelVorschaubilderIn the QuarryGuarding the TunnelVorschaubilderIn the QuarryGuarding the TunnelVorschaubilderIn the QuarryGuarding the TunnelVorschaubilderIn the Quarry
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CC-BY-SA-4.0: RalfHuels (photographer), Anja Arenz, Chris Kunz, Dossmo, Niamh, Paolo Tratzky, Svenja Schoenmackers