There is a bookshelf called The Harvard Classics.

The collection of literary works, philosophical texts, and scientific writings was initially titled "Dr. Eliot's Five Foot Shelf." It was assembled by Charles W. Eliot, who served as Harvard University's president.

Almost all the books can be read for free in Gutenberg.

https://en.wikipedia.org/wiki/Harvard_Classics

https://www.gutenberg.org/ebooks/bookshelf/40

My favourite will always be the plays of William Shakespeare. It has it all.