There are very few modern novels I have an interest in. But I do read quite a bit. Just finished two of Victor Hugo's works, "The Hunchback of Notre Dame" and "Les Miserables" for the upteenth time. IMO, Hugo is the best writer from the Romantic Period.
The modern authors Dan Brown and Tom Clancy are skilled at plot development.
Charles Dickens was a great social critic of his time via his novels, although I am ideologically on the other end of the spectrum. "David Copperfield" is one of best.
"Huckleberry Finn," by Mark Twain. Another good re-read as the author deals with freedom versus society and even manifest destiny.
Not well known anymore (he won the Nobel Prize for Literature in the 1940's) is Hermann Hesse. Some books are "Steppenwolf," "Siddhartha," "Magister Ludi,"Demian," and "Narcissus and Goldman." All are fairly short books. Most of his works are about the individual's search for knowledge and spirituality. Like some authors, critics think his novels present a kind of philosophy. Again, not my cup of teas, but I read things that challenge my beleifs.
The poems of Robert Service are fun reads. Not "fine art" but I think many of us can relate to several of them.
I have re-read Ayn Rand's "The Fountainhead" and "Atlas Shrugged" every year since 1969. Highly recommended, and potential Chaff firestorm here on BPL.
I often read Colin Fletcher and Edward Abbey again and again.
Castaneda's works are interesting. They were popular during the drug culture days of the late 60's and early 70's, and eventually found to be a fraud (opinon of many). I think UCLA actually revoked his PHD, which was based on his first book, "The Teachings of Don Juan." Last year I found all of his books in my garage, stored there for several decades. I read them again, and they are enjoyable reading. But just keep in mind they are probably works of fiction.
If you like fantasy, J.R.R. Tolkien is fun reading. Haven't read any of his stuff since I was a kid.
Don't forget Jules Verne one of the earliest science fiction writers.
One book I remember is the "Mouse that Roared," because the author was in one of my college classes. Can't remember his name, but the book was simple with a unique perspective. He was much older than all of us in the class, and was a already a successful writer. I don't remember the class or even why he was taking it.