The city turned its dreariest aspect toward the railway on blackened walls, irregular and ill-paved streets, gloomy warehouses, and over all a gray, smoke-laden atmosphere which gave it mystery and often beauty. Sometimes the softened towers of the great steel bridges rose above the river mist like fairy towers suspended between Heaven and earth. And again the sun tipped the surrounding hills with gold, while the city lay buried in its smoke shroud, and white ghosts of river boats moved spectrally along.