Purgatorio is the second part of Dante's Divine Comedy.  Between heaven (Paradiso) and hell (Inferno) the Purgatory is the home to those who sinned in life but are working off their bad deeds to enter heaven.  Portrayed by Dante as a mountain, Purgatory has an "ante-Purgatory" which consists of excommunicates and late repentants, as well as seven terraces, each dedicated to a deadly sin (pride, envy, wrath, sloth, covet, gluttony, lust).  There is also a top layer, closest to heaven - the Earthly Paradise, or Garden of Eden.