For eighteen months in 1860 and 1861, relays of light riders on fast horses carried letters 1,900 miles from the Missouri River to California. It took about ten days, was never profitable, and was made obsolete by the telegraph within a year and a half — yet it became one of the great legends of the Old West.
The route follows the mail west through eight places: the stables where the first rider set out, a surviving station in Kansas, Fort Kearny, Julesburg, the plains where Mark Twain saw a rider flash past his stagecoach, Utah, the Nevada desert and the terminus in Sacramento. Where legend (Buffalo Bill, Twain's eight days) outruns the record, the text says so.
In June 1867 the steamship Quaker City left New York on what Mark Twain called his "Great Pleasure Excursion", a chartered trip to Europe and the Holy Land. A newspaper, the Alta California, paid for his place in exchange for fifty articles, and those letters grew into The Innocents Abroad.
This route follows eight stops: the Wall Street pier, the Azores, Tangier, Milan, Athens, a palace garden near Yalta, Jerusalem and the Sphinx. Each is told through Twain's own scenes, from donkey rides and hotel bills to the places that stopped his jokes. Where he does not name a spot, the pin marks the nearest known place.
Huck Finn fakes his own murder and, with Jim, who has run away from slavery, takes a raft down the Mississippi. Their goal is Cairo, where Jim would be a free man the minute he saw it. They miss it in the fog and drift on into slave country, past a feud, two con men and a farm with the book's last twist.
Twain built St. Petersburg from his boyhood town of Hannibal. Most places in the novel are invented, so each pin marks a real landmark or stand-in, and the Grangerfords' country and Bricksville stay off the map.