Ключевые слова: abstract, architecture, background, buildings, cellar, cement, coal mine, coalmine, construction, corridor, dark, darkness, design, down under, empty, entrance, facility, floor, footpath, grunge, hallway, helical, historic, indoors, industrial, industry, infrastructure, level, levels, light, mining, modern, montane, old, passage, perspective, place, production, railing, reinforcement, road, round, steampunk, structure, track, traffic, underground, urban, urbania, view,