This carefully researched guide takes the reader into some of the world's most famous churches, decoding messages that are hidden in plain sight, in stained-glass windows, statuary, patterned flooring, ornamentation and even the buildings' architectural design. Why do fierce beasts and grotesque faces peer from the walls? Who chose to depict one particular saint and not another? What's the significance of an eagle? A dragon? A pelican? No one who reads this book will ever again experience a visit to a cathedral in quite the same way.