phantasmagoric, phantasmagorical, surreal, surrealistic -- (characterized by fantastic imagery and incongruous juxtapositions; "a great concourse of phantasmagoric shadows"--J.C.Powys; "the incongruous imagery in surreal art and literature")
dreamlike, surreal -- (resembling a dream; "night invested the lake with a dreamlike quality"; "as irrational and surreal as a dream")