Why does Aeneas go to the underworld?

Aeneas journeys to the Underworld in Book VI of Virgil's "Aeneid" primarily to seek guidance from his deceased father, Anchises. He hopes to gain insights into his destiny and the future of the Trojans as they establish a new homeland in Italy. This descent also serves to highlight themes of fate, duty, and the connection between the living and the dead in Aeneas's epic quest. Additionally, it allows Aeneas to encounter the spirits of fallen comrades and understand the significance of his journey.