O rly? How many levels? Describe in detail each of the levels.
The Circles of Hell
Virgil guides Dante through the nine circles of Hell. The circles are concentric, representing a gradual increase in wickedness, and culminating at the center of the earth, where Satan is held in bondage. Each circle's sinners are punished in a fashion fitting their crimes: each sinner is afflicted for all of eternity by the chief sin he committed. People who sinned but prayed for forgiveness before their deaths are found in Purgatory – where they labor to be free of their sins – not in Hell. Those in Hell are people who tried to justify their sins and are unrepentant. Furthermore, those in Hell have knowledge of the past and future, but not of the present. This is a joke on them in Dante's mind because after the Final Judgment, time ends; those in Hell would then know nothing.
[edit] First Circle (Limbo)
Here reside the unbaptized and the virtuous pagans, who, though not sinful, did not accept Christ. They are not punished in an active sense, but rather grieve only their separation from God, without hope of reconciliation. Limbo shares many characteristics with the Elysian Fields; thus the guiltless damned are punished by living in a deficient form of Heaven. Without baptism ("the portal of faith," Canto IV.36) they lacked the hope for something greater than rational minds can conceive. Limbo includes green fields and a castle, the dwelling place of the wisest men of antiquity, including Virgil himself, as well as the Islamic philosophers Averroes and Avicenna. In the castle Dante meets the poets Homer, Horace, Ovid, and Lucan and the philosophers Socrates and Aristotle as well as the Roman general and politician Julius Caesar. Interestingly, he also sees Saladin in Limbo (Canto IV). Dante implies that all virtuous pagans find themselves here, although he later encounters two in heaven and one (Cato of Utica) in Purgatory.
Beyond the first circle, all of those condemned for active, deliberately willed sin are judged by Minos, who sentences each soul to one of the lower eight circles by wrapping his tail around himself a corresponding number of times. The lower circles are structured according to the classical (Aristotelian) conception of virtue and vice, so that they are grouped into the sins of incontinence, violence, and fraud (which for many commentators are represented by the leopard, lion, and she-wolf[4]). The sins of incontinence — weakness in controlling one's desires and natural urges — are the mildest among them, and, correspondingly, appear first.