Ключевые слова: arc, architectural, architecture, banister, brick, canal, channel, czech, deep, dirty, environmental, geometric, historical, industrial, industry, interior, mysterious, mystery, old, pollutants, pollute, pollution, prague, protection, republic, river, sewage, sewer, smell, spooky, stream, subterranean, system, town, tube, tubing, tunnel, under, underground, unhygienic, unpleasant, urban, wall, waste, water, way, wet,