The Innocents Abroad, or The New Pilgrims' Progress is a travel book by American author Mark Twain published in 1869 which humorously chronicles what Twain called his "Great Pleasure Excursion" on board the chartered vessel Quaker City (formerly USS Quaker City) through Europe and the Holy Land with a group of American travelers in 1867. It was the best-selling of Twain's works during his lifetime, as well as one of the best-selling travel books of all time.For months the great pleasure excursion to Europe and the Holy Land was chatted about in the newspapers everywhere in America and discussed at countless firesides. It was a novelty in the way of excursions-its like had not been thought of before, and it compelled that interest which attractive novelties always command. It was to be a picnic on a gigantic scale. The participants in it, instead of freighting an ungainly steam ferry-boat with youth and beauty and pies and doughnuts, and paddling up some obscure creek to disembark upon a grassy lawn and wear themselves out with a long summer day's laborious frolicking under the impression that it was fun, were to sail away in a great steamship with flags flying and cannon pealing, and take a royal holiday beyond the broad ocean in many a strange clime and in many a land renowned in history!