Washington DC was, indeed, built on reclaimed swamp, but it does have the distinction of a city street plan created by the renowned Pierre L'Enfant, and the National Mall in particular, benefits from his vision:
https://en.wikipedia.org/wiki/L%27Enfant_Plan
Trump certainly appreciates the Mall – so much so, that he imagined it full of a record-setting crowd for his Inauguration!
http://www.cnn.com/2017/01/20/politics/donald-trump-barack-obama-inauguration-crowd-size/index.html
The real shame here is that we have a President who is such an unqualified vulgarian, that he would call our country's most revered residence a "dump."
Anyone with discernment who has seen a garish, gold-plated, Trump-designed business property – and I passed the Trump Building at 40 Wall Street for many years getting to work at 72 -- knows the brutal, self-absorbed excess that he considers good taste.
Gold is part of how Trump branded his multi-billion dollar empire. I guess gold offends you. You must be racist The favorite colors of black people are gold and black. Shame on you, RACIST!