by Jen Green is a book that provides a scientific and balanced account of the ancient Celtic civilization. It covers the distinctive languages, art, and mythologies of the Celts and explores their enduring quest in Northern Europe. The book discusses how the Celts rarely used written language, instead passing along beliefs, knowledge, and wisdom through oral traditions. It also examines artifact-rich burial grounds, like the megalithic tombs at Newgrange, Ireland, inscribed stones, and stone circles like Stonehenge, which all yield clues to their mysterious ways. The book includes aerial photos, timelines, informative sidebars, and famous National Geographic maps to augment the text. It asks and answers interesting questions, such as why the Celts made human sacrifices and what happened when the Romans came. Additionally, the book explains techniques and processes used by both the Celts and archaeologists to study them, providing a comprehensive overview of Celtic culture in Europe. The book is aimed at children aged 10-14 years old and is part of the National Geographic Investigates series.