Gulliver sets sail again and, after an attack by pirates, ends up in Laputa, where a floating island inhabited by theoreticians and academics oppresses the land below, called Balnibarbi. The scientific research undertaken in Laputa and in Balnibarbi seems totally inane and impractical, and its residents too appear wholly out of touch with reality. Taking a short side trip to Glubbdubdrib, Gulliver is able to witness the conjuring up of figures from history, such as Julius Caesar and other military leaders, whom he finds much less impressive than in books. After visiting the Luggnaggians and the Struldbrugs, the latter of which are senile immortals who prove that age does not bring wisdom, he is able to sail to Japan and from there back to England.