Has there been any good art made since the 1800s?
Look up the Highwaymen of Florida, black artists in the Jim Crow era who sold their art out of the trunks of their cars. They specialized in Florida landscapes. My favorite of the bunch is Alfred Hair. Some of his stuff was beautiful.
Andrew Wyeth was pretty good.
I like some of Pablo Picasso works.
I also like some of the Salvador Dali paintings.