Book 6 of Virgil's Aeneid

Summary
Aeneas and his crew arrive at Italy. Following his fathers advice he visits the temple of Apollo to pray, where he finds a priestess named Sibyl. He asks Sibyl if she can grant him entrance into the Underworld, and she says this will only be possible if he buries Misenus, and if he finds a golden branch from a tree which has to snap off easily. He returns to Sibyl, having completed the tasks.
When they arrive at the Underworld, they see souls who are not granted entrance because they have not been buried properly. Charon the boatman lets them pass the river when he sees the golden branch.
In the part of the Underworld for people who died in the same of love, he finds Dido. Aeneas tries to speak to the ghost of Queen Dido and tells her that he actually did not want to leave her, but he was following the orders of the gods. Dido ignores him and runs to Sychaeus, her once husband. 

He’s lead by Sibyl through the Underworld. Next they speak to spirits of those who died at war. Aeneas finds Deiphobus, the son of Priam, whose body is torn apart.

From a distance, Aeneas observes Tartarus, the part of the Underworld where the evil are punished. He watches the Fury Tisiphone whip the guilty, as Sibyl explains to him what other creatures and punishments await sinners.

After Aeneas places his golden branch by the gates of Elysium they are granted access. In the Groves of Blessedness, he finds his father Anchises. Anchises shows him all the spirits who will be purified and given another life so they may make Rome prosper. After Aeneas’ soul has been moved and inspired to create Rome, he leaves the Underworld through the ivory gates. 

Epic Simile

Lines 1033-1047

My son, it is beneah his auspices

that  famous Rome will make her boundaries

as broad as earth itself, will make her spirit

the equal of Olympus, and enclose

her seven hills within a single wall,

rejoicing in her race of men: just as

the Berecynthian mother, tower-crowned,

when, through the Phrygian cities, she rides on

her chariot, glad her sons are gods, embraces

a hundred sons of sons, and every one

a heaven-dweller with his home on high.

Quotable Passages

Lines 725-735

Aeneas suddenly looks back; beneath

a rock upon his left he sees a broad

fortress encircled by a triple wall

and girdled by a rapid flood of flames

that rage: Tartarean Phlegethon whirling

resounding rocks. A giant gateway stands

in front, with solid adamantine pillars—

no force of man, not even heavens’s sons,

enough to level these in war; a tower

of iron rises in the air; there sits

Tisiphone, who wears a bloody mantle.

Lines 846-854

They came upon the lands of gladness, glades

of gentleness, the Groves of Blessedness—

a gracious place. The air is generous;

the plains wear dazzling light; they have their very

own sun and their own starts. Some exercise

their limbs along the green gymnasiums

or grapple on the golden sand, complete

in sport, and some keep time with moving feet

to dance and chant.