The legend of Atlantis has fascinated historians, writers, and explorers for centuries. In his influential 1882 book Atlantis: The Antediluvian World, Ignatius Donnelly thoroughly investigated what he considered Atlantis's lost civilisation. This post reviews Donnelly's theories, the historical background, and the continuing influence of his ideas on popular culture and modern scholarship. A copy of Donnelly's book is linked to this Blog Post.