A Tramp Abroad is a work of travel literature, including a mixture of autobiography and fictional events, by American author Mark Twain, published in 1880. The book details a journey by the author, with his friend Harris (a character created for the book, and based on his closest friend, Joseph Twichell), through central and southern Europe. While the stated goal of the journey is to walk most of the way, the men find themselves using other forms of transport as they traverse the continent. The book is the third of Mark Twain's five travel books and is often thought to be an unofficial sequel to the first one, The Innocents Abroad. The first half of the book covers their stay in south-western Germany (Heidelberg, Mannheim, a trip on the Neckar river, Baden-Baden and the Black Forest). The second part describes his travels through Switzerland and eastern France (Lucerne, Interlaken, Zermatt, Chamonix and Geneva). The end of the book covers his trip through several cities in northern Italy (Milan, Venice and Rome). Several other cities are touched and described during their travels, as well as mountains such as Matterhorn, the Jungfrau, the Rigi-Kulm and Mont-Blanc.