The fifth and final painting is "Desolation."
Man is long gone from the area, and his creations have been reclaimed by nature.
The land resembles the land in the first painting again. You can imagine, that given more time, the land will once again completely return to the savage state.
I'm sure that there are better, more in depth examples of these paintings, but I mainly just wanted to post them because I like them and you're post made me think of them.