This book studies authenticity, which is a kind of truth to self, through the study of heritage tourism. When a heritage site is inauthentic, it leads to misinformation. Tourism scholars have been studying authenticity for about 50 years, and this book draws upon the theories and approaches of tourism studies to understand better misinformation, which has become a major topic of study since the US presidential elections in 2016. The book includes a discussion of common-sense and academic notions of authenticity, surveys a half century of scholarship on authenticity, and provides three case studies of heritage tourism sites: Lindsborg, KS (known as Little Sweden, USA), Colonial Williamsburg in Virginia, and the Gettysburg battlefield in Pennsylvania.