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Although this was on the list of fantasy books for the 101 Fantasy Books in 10 Years challenge, it's really not a fantasy. This is a simple Christian allegory of the journey to heaven.
Published in 1678, it describes the adventures of "Christian" and his friend "Hopeful" as they leave their doomed hometown of City of Destruction to the Celestial City. They encounter various forms of temptation to stray from the straight and narrow path, and are subject to both inner and outer obstacles. It's written with a decidedly Protestant bent. Indeed, one of their obstacles is "Pope."
I was inspired to read this after finding it on the list of fantasy books, having just read "Little Women" again. In "Little Women," Jo remembers playing "Pilgrim's Progress" as young children with "rag-bags on our backs for burdens."