Terra-Infinita, Extraterrestrial Worlds and their Civilizations by Claudio Nocelli is a 2022 alternative-geography book that presents a "flat world" narrative. It tells the story of Helen, daughter of navigator William Morris, who reveals secrets of civilizations located behind massive ice walls, focusing on extraterrestrial worlds, hidden human history, and pre-reset Earth. The book is part of a series or trilogy exploring these concepts, often categorized within niche conspiracy/alternative literature.