Two of my favourite poems include "Ode to a Nightingale" by John Keats and "Jabberwocky" by Lewis Carroll. Both force the reader to examine the poet's choice of diction and words used. In the case of Keats, his work is written in high diction and some of the words he uses aren't understandable in context without a bit of added research (through a dictionary, encyclopedia or a few footnotes... So long as you can understand the meaning and relavance of his ideas, really)... Carroll simply makes up words, which adds to the fanciful nature of his poetry. Both poems hold great stories, but the ways in which they are expressed mean more to the stories of the poems than the poems themselves. If you read and enjoy "Jabberwocky," compare it to a great epic like Beowulf, Gilgamesh, or Homeric writings- the similiarities between such a weird poem full of make believe and some of the greats are really neat to think about.