Ключевые слова: building, built structure, business, coal mine, cultural heritage, destination, eat, economy, europe, factory, famous place, germany, heavy engineering, heavy industry, heavy manufacturing, industrial architecture, industrial culture, industrial heritage, industrial monument, industry, landmark, mine, mining, old economy, pit, plans, point of interest, ruhr area, ruhr metropolis, sights, sightseeing, tourism, tourist attraction, travel, travel destinations, zollverein, zollverein colliery,