In 1851, he published "In Sweden", a volume of travel sketches. The publication received wide acclaims. A keen traveler, Andersen published several other long travelogues: "Shadow Pictures of a Journey to the Harz, Swiss Saxony, etc. etc. in the Summer of 1831", "A Poet's Bazaar", "In Spain" and "A Visit to Portugal in 1866". (The last describes his visit with his Portuguese friends Jorge and Jose O'Neill, who were his friends in the mid-1820s while he was living in Copenhagen.) In his travelogues, Andersen took heed of some of the contemporary conventions related to travel writing but he always developed the style to suit his own purpose. Each of his travelogues combines documentary and descriptive accounts of his experiences, adding additional philosophical passages on topics such as what it is to be an author, general immortality, and the nature of fiction in literary travel reports. Some of the travelogues, such as "In Sweden", even contain fairy-tales.