Rossetti was one of the great poets of all time, and while "Goblin Market" is (of course) her masterpiece, her shorter works are also lovely.
Also, formatting poetry in markdown's a right pain the ass, and god help me if I ever want to post an e e  cummings poem.
Remember me when I am gone away,
           Gone far away into the silent land;
           When you can no more hold me by the hand,
Nor I half turn to go yet turning stay.
Remember me when no more day by day
           You tell me of our future that you plann'd:
           Only remember me; you understand
It will be late to counsel then or pray.
Yet if you should forget me for a while
           And afterwards remember, do not grieve:
           For if the darkness and corruption leave
           A vestige of the thoughts that once I had,
Better by far you should forget and smile
           Than that you should remember and be sad.