underground pedestrian passage

altitude architectural architecture bared bars black block bricks bridge building cage city concrete corridor crossing dark direction distance drain end entrance exit floor fluorescent foot footpath footway gangway glass gray grey hightway hole indoor inside lamp lamps light lights metro modern moscow moving nobody passage passageway pattern pedestrian perspective plates public railings rectangle russia shining square staircase stairs stairway station straight street subway sunlight sunshine tiled tiles town train transition tushino under underground underpass urban walkway wall walls way white