People have been traveling for many centuries -- by ship, on horseback, by camel caravan. But to tell us just who the first tourists were, we thought we'd turn to an expert. Nick Yapp, author of "Bon Voyage: An Oblique Glance at the World of Tourism," takes us on a fascinating voyage through the history of tourism and the evolution of the modern tourist, and offers some striking predictions for travel in the 21st century.

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Savvy Resources: Nick Yapp's book, "Bon Voyage: An Oblique Glance at the World of Tourism" on Amazon.com