COVER—Pictures from History/Bridgeman Images; 1—Marco Merola; 3—(clockwise from top left) Courtesy Andrew Peachey (ArchSol), Courtesy of Fairfield Foundation, Agata T. Gondek, Eitan Klein/Israel Antiquities Authority, © Frédéric Colin, University of Strasbourg; 4—Azoor Photo Collection/Alamy Stock Photo; 6—Art Resource, NY; 8—Courtesy Francisco Valdez; 9—Virginia Department of Historic Resources; 10—Courtesy of Fairfield Foundation, NUTAN/Gamma-Rapho via Getty Images, Pampuco via Wikimedia Commons; 12—© Frédéric Colin, University of Strasbourg (3); 13—blickwinkel/Alamy Stock Photo; 14—Courtesy Andrew Peachey (ArchSol), Courtesy Effie Fotos-Jones; 16—©MOLA Headland (2); 17—Eitan Klein/Israel Antiquities Authority 18—© MOLA; 19—Wikimedia Commons; 20—Courtesy Erlin Novita/Papua Archaeological Center, ADEK BERRY/AFP/Getty Images, Faina Gurevich/Alamy Stock Photo, Courtesy Alpine Archaeological Consultants; 21—Courtesy Rejane Roure; 22—Courtesy Albína Hulda Pálsdóttir, Agata T. Gondek; 23—Courtesy Mu.Ramkumar; 24—(clockwise from top left) Photo by Richard Estrada, Courtesy Betina Magnussen, Arsty/iStock, Courtesy Nicole E.…