Leaves of Grass by Walt Whitman. His empathy for all different kinds of people, and intimate observation of everyday life, are wonderful. Out of the Cradle Noiseless Patient Spider
Also, DH Lawrence’s death poems (Shadows, Ship of Death, Medlars and Sorb Apples, Bavarian Gentians). Some literary works have a strong message, like hope or existential despair. I like these because there’s a balance between both feelings, and no final decision. You get the feeling that the poet was wrestling with these thoughts, and facing his own mortality, and never came down on one side or the other.
Hart Crane- Voyages Just for pure beauty and craftsmanship. Every word is carefully, intentionally chosen and placed, but the effect is flowing and mesmerizing. It just stands on its own as one of the most beautiful things ever created.