What was the title of Mark Twain's 1869 travel book about a cruise to Europe and the Holy Land?

Mark Twain's 1869 travel book about a cruise to Europe and the Holy Land was The Innocents Abroad. Its full title was The Innocents Abroad, or The New Pilgrims' Progress.

The book grew out of Twain's five-month journey aboard the chartered steamship Quaker City in 1867. He traveled with a group of American tourists, visiting parts of Europe, the Mediterranean, and the Holy Land. Twain had been hired to send reports of the trip to the Alta California newspaper, and he later reshaped those reports into a book.

Rather than presenting a solemn pilgrimage, Twain used satire to challenge romantic travel writing and the exaggerated descriptions commonly found in nineteenth-century guidebooks. He compared famous historical and religious sites with the expectations of American travelers, often undercutting grand claims with comic observation. The book became Twain's best-selling work during his lifetime and helped establish him as a nationally recognized author. It is sometimes confused with Roughing It, his later account of travel through the American West.