Itinerarium exstaticum quo mundi opificium is a 1656 work by the Jesuit scholar Athanasius Kircher. It is an imaginary dialogue in which an angel named Cosmiel takes the narrator, Theodidactus ('taught by God'), on a journey through the planets. It is the only work by Kircher devoted entirely to astronomy, and one of only two pieces of imaginative fiction by him. A revised and expanded second edition, entitled Iter Exstaticum, was published in 1660.