Louis D’Amore, founder and president of the International Institute for Peace through Tourism, noted in an article titled “Peace through Tourism: A Historical and Future Perspective” that “It may have been Mark Twain real name Samuel Clemens who first recognized the value of tourism in promoting peace.” Mark Twain’s book, The Innocents Abroad , chronicles his 1867 travels through Europe and the Holy Land. In The Innocents Abroad , which was his best-selling work during his lifetime as well as being one of the best-selling travel books of all time.
David L. Edgell (Tue,) studied this question.