Or, a vision in a dream. A Fragment.  In Xanadu did Kubla Khan  A stately pleasure-dome decree:  Where Alph, the sacred river, ran  Through caverns measureless to man     Down to a sunless sea.  So twice five miles of fertile ground  With walls and towers were girdled round;  And there were gardens bright with sinuous rills,  Where blossomed many an incense-bearing tree;  And here were forests ancient as the hills,  Enfolding sunny spots of greenery.  But oh! that deep romantic chas