The Pilgrim's Progress is a 1678 allegory written by John Bunyan. Christian is the leading character in the allegory. The book tells his adventurous journey from his hometown, the 'City of Destruction' to the 'Celestial City' atop Mount Zion.
The book has been translated into more than 200 languages. Because of the widespread popularity of The Pilgrim's Progress, Christian's hazards (the 'Valley of the Shadow of Death', 'Doubting Castle', and the 'Enchanted Ground'), his temptations (the wares of 'Vanity Fair' and the pleasantness of 'By-Path Meadow'), and the places he visits (the 'House Beautiful', the 'Delectable Mountains') have become commonly used proverbial phrases in English.