Too many to name or to remember, but most of them are short. Of the longer ones I've memorized, I can think of:
-The opening paragraph of The Canterbury Tales' General Prologue
-Keats' To Autumn
-Frost's Design
-Yeats' Meru, A Dialogue of Self and Soul, Sailing to Byzantium, Byzantium
-Wallace Stevens' Plain Sense of Things and Final Soliloquy of the Interior Paramour
-Byron's She Walks in Beauty
-James Merrill's Christmas Tree
-Donne's Holy Sonnet XIV, Forbidden Mourning, Air and Angels
-Herbert's Prayer (I)
Surely others I'm forgetting