In Mammoth Hot Springs, in the Albright Visitor Center, there is a permanent display of some of Moran's watercolors and Jackson's photographs. They are displayed in a very dark area (to keep the colors from fading). I enjoyed seeing the sights as they looked when Moran saw them in 1871-1872 - and then compared those sights with the way they looked as we travelled to some of those same sights.
I picked up a couple of postcards - which were highly saturated - to have a souvenir of his work. Can you imagine going to some place wild and undocumented and being the one to return with work to show what you've seen? If I remember the program correctly, he was the first artist to sell a painting to be displayed in the halls of Congress - an oil painting of a waterfall in Yellowstone.