Final answer:
The object of Gylfi's journey in the Prose Edda is to seek wisdom and knowledge from the gods in Asgard.
Step-by-step explanation:
The object of Gylfi's journey in the Prose Edda is not directly addressed in the passage provided. The passages do speak to historical expeditions in the Norse sagas, such as those by Leif Ericson to Vinland and other explorations by Norse figures.
However, to specifically answer what Gylfi sought in the Prose Edda, we must look to the text itself where Gylfi, disguised as Gangleri, journeys to Asgard seeking wisdom and knowledge from the gods.