The Question and Answer section for The Aeneid is a great resource to ask questions, find answers, and discuss the novel.
I believe Sibyl joins Aeneas to the underworld. Aeneas must find a tree sprouting a golden bough and pluck this bough as a gift to Proserpina, the queen of the underworld.
Aeneas experiences a horrific storm at sea, caused by Aeolus is response to Juno's wishes. Neptune, angered by another god's iterference in his domain, calms the sea. When he lands at Carthage, Aeneas observes the area and sees no other ships, but...
Aeneas? After landing in Carthage, Aeneas explores the area with Achates. He also meets his mother, the goddess Venus (whom he does not recognize), and eventually come upon the shrine Dido is building in Juno's honor.