Gorgeous cherry blossom w/the Jefferson Memorial pic, NIKK.
It is isn’t it!!
A biological growth is making the Thomas Jefferson Memorial appear black, filthy and grimy in spots. And this week the National Park Service began tests to see if they can find a way to remove the spreading grime.
https://wtop.com/dc/2016/08/nps-ready-to-battle-grimy-biofilm-coating-jefferson-memorial/slide/1/