This fascinating volume explores an important fifteenth-century illustrated manuscript tradition that provides a revealing glimpse of how western Europeans conceptualized the world. From the classical encyclopedias of Pliny to famous tales such as The Travels of Marco Polo, historical travel writing has had a lasting impact, despite the fact that it was based on a curious mixture of truth, legend, and outright superstition. One foundational medieval source that expands on the ancient idea of the "wonders of the world" is the fifteenth-century French Book of the Marvels of the World, an illustrated guide to the globe filled with oddities, curiosities, and wonders--tales of fantasy and reality intended for the medieval armchair traveler. The fifty-six locales featured in the manuscript are presented in a manner that suggests authority and objectivity but are rife with stereotypes and mischaracterizations, meant to simultaneously instill a sense of wonder and fear in readers. In The Book of Marvels, the authors explore the tradition of encyclopedias and travel writing, examining the various sources for geographic knowledge in the Middle Ages. They look closely at the manuscript copies of the French text and its complex images, delving into their origins, style, content, and meaning. Ultimately, this volume seeks to unpack how medieval white Christian Europeans saw their world and how the fear of difference--so pervasive in society today--is part of a long tradition stretching back millennia. This volume is published to accompany an exhibition on view at the J. Paul Getty Museum at the Getty Center from June 11 to September 1, 2024, and at the Morgan Library & Museum from January 24 to May 25, 2025.