Unlocking Secrets of the Unknown with National Geographic" is a nonfiction book that chronicles some of the significant discoveries and research endeavors funded by the National Geographic Society since 1890. It highlights the work of scientists and explorers who have received grants to unravel mysteries of the Earth, including figures like Jane Goodall, Richard Leakey, and Jacques Cousteau. The book covers a diverse range of topics, such as geography, life sciences, history, and exploration, and is richly illustrated.