But Sacco was more interested in traveling. In 1988, he left the U.S. again to travel across Europe, a trip which he chronicled in his autobiographical comic "Yahoo" (also published by Fantagraphics). The trip led him towards the ongoing Gulf War (his obsession with which he talks about in "Yahoo" #2), and in 1991 he found himself nearby to research the work he would eventually publish as "Palestine", a documentary graphic novel, which gather testimonies of survivors of war and trauma.