Ignatius Donnelly's Atlantis: The Antediluvian World popularized the theory of a lost civilization known as Atlantis. Published in 1882, the book presents evidence from ancient texts, geological formations, and myths to argue that Atlantis existed before a catastrophic event led to its destruction. Donnelly's work sparked interest in Atlantis, influencing both scientific and popular discussions. A fascinating read for those interested in ancient civilizations and lost worlds.