remains of warsaw uprising, warsaw city, poland

army art asphalt blue brick brickwork canalization capital city cobblestone cover dluga drain escape evacuation famous fight floor flooring german hatch hatchway historic historical history hole home insurgents iron lane line manhole memory movement nazi occupation paved paving poland polish powstanie remains remembrance resistance rock roof sand second sewage sewer sewerage sidewalk soil street system trail uprising used walkway wall war warsaw warszawa warszawskie world ww2 wwii