On Sunday, I visited the New-York Historical Society, which has the most extensive collection of his watercolors and prints.
The two huge murals in the photo above are beautiful reproductions.
The watercolors, very sensitive to light, are in a slightly darkened room and rotated every month. This month, vireos are on display.
Before you go: See if your library has a free pass to the museum that you can borrow. Allendale's Lee Memorial Library has free passes to several major museums.