The Pilgrim's Progress is an allegory whose protagonist, Christian, appears to the author in a dream. The first part of the book tells the story of Christian's journey from the City of Destruction, which he flees thanks to Evangelist's warning, to the Celestial City. Christian travels with Faithful and Hopeful. The second part tells the same journey made by Christian's wife, Christiana, and their children following a vision. Christiana is accompanied by her maid Mercy. The City of Destruction, the point of departure of both journeys, represents wordliness and, to progress from this godless state to the Celestial City, Christian and later his wife have to overcome the many obstacles in the Slough of Despond, the Valley of the Shadow of Death, the Vanity Fair, the Doubting Castle and the Delectable Mountains.