Minas Ithil was a beautiful place. The moon cast silver light throughout the courtyards and streets, and reflected off the marble walls, so that it seemed to shine, the houses shining white as well. The city also had one tall tower, with many windows, that rotated slowly. The city was accessed by a road, which was said to gleam like the city's white marble walls, running over a bridge as it crossed Imlad Morgul. Large meadows were placed on both banks of the stream.
When it was taken by the forces of evil, the beauty was replaced by terror. The lovely white light was replaced by a sickly corpse-pale light, the meadows were filled with sick pale flowers, and Imlad Morgul began to steam cold poisonous vapours. At the head of the bridge crossing the stream the bestial and human figures that stood there were corrupted.
https://www.youtube.com/watch?v=sP1zQWvRVk8