บิล, Zollverein, อาหาร, Ruhr, พื้นที่รูห์ร, อาคาร, อุตสาหกรรม, มรดกโลก, การชมทิวทัศน์, ประวัติศาสตร์, หอคอย
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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