Ключевые слова: architecture, bauhaus, blue, building, business, coal, cocking, coking, colliery, complex, culture, day, design, essen, facility, factory, frame, german, germany, heritage, historical, history, industrial, industry, kokerei, landmark, metal, mine, miner, mining, monument, nordrhein, old, plant, red, ruhr, ruhrgebiet, site, sky, steel, tower, travel, unesco, vintage, washery, westfalen, work, world, zeche, zollverein,