Erinnerungen an die Zukunft

'Chariots of the Gods? Unsolved Mysteries of the Past' (German: Erinnerungen an die Zukunft: Ungelöste Rätsel der Vergangenheit; in English, Memories of the Future: Unsolved Mysteries of the Past) is a book authored in 1968 by Erich von Däniken. It involves the hypothesis that the technologies and religions of many ancient civilizations were given to them by ancient astronauts who were welcomed as gods.

The first draft of the publication had been rejected by a variety of publishers. The book was extensively rewritten by its editor, Wilhelm Roggersdorf (a pen name of the German screenwriter Wilhelm "Utz" Utermann).