This book challenges young readers to identify anachronisms and historical inaccuracies within illustrated scenes depicting famous journeys. The author, AJ Wood, presents twenty distinct mistakes in each visual spread, prompting critical observation and historical recall. Readers are encouraged to scrutinize depictions of explorers and their expeditions, from ancient voyages to space travel, fostering an engaging learning experience.

The book is designed as an interactive educational tool for children, encouraging active engagement with historical content. Its format of 'spot the mistake' is likely to appeal to young learners by gamifying the process of historical discovery and fact-checking. The inclusion of a wide range of explorers and journeys suggests an aim to provide a broad overview of human exploration across different eras and cultures.