sentences:  In 1957, Silverstein became one of the leading cartoonists in "Playboy", which sent him around the world to create an illustrated travel journal with reports from far-flung locales.During the 1950s and 1960s, he produced 23 installments called "Shel Silverstein Visits..." as a feature for "Playboy".Employing a sketchbook format with typewriter-styled captions, he documented his own experiences at such locations as a New Jersey naturist community, the Chicago White Sox training camp, San Francisco's Haight-Ashbury district, Fire Island, Mexico, London, Paris, Spain and Africa.