In which of Dante's works is the first part of a journey through the afterlife depicted?

Dante's "Inferno" depicts the first part of his journey through the afterlife. In this work, Dante journeys through Hell, which he imagines as a series of nine concentric circles, each representing different sins and their corresponding punishments. The narrative serves as an exploration of sin, justice, and redemption.

The overarching structure of Dante's journey is presented in "The Divine Comedy," which encompasses all three parts: "Inferno," "Purgatorio," and "Paradiso." However, since the question specifically asks for the first part of the journey, "Inferno" is the most appropriate answer, as it is solely focused on Dante's experiences in Hell. The other two parts, "Purgatorio" and "Paradiso," explore the realms of Purgatory and Heaven, respectively. Thus, "Inferno" is the correct choice for illustrating the beginning of Dante's afterlife journey.