What was the title of C.S. Lewis's 1933 book about a journey through an allegorical landscape?

C.S. Lewis’s 1933 book about a journey through an allegorical landscape is The Pilgrim’s Regress. Its full subtitle identifies it as an allegorical apology for Christianity, reason, and romanticism.

The central character, John, travels through a landscape representing competing beliefs and philosophies. The work reflects Lewis’s movement from atheism toward Christianity and his attempt to explore the intellectual and imaginative forces behind that change.

The title deliberately recalls John Bunyan’s The Pilgrim’s Progress, but Lewis’s book is not a sequel. Lewis uses invented names, symbolic places, and conversations to dramatize philosophical arguments. Because of its dense allusions and unfamiliar structure, it is generally considered less accessible than his later popular works.

Lewis revised the book’s preface for a later edition, acknowledging that some readers had found the allegory difficult to follow. The 1933 publication came shortly after his Christian conversion and before he became widely known for works such as The Screwtape Letters and The Chronicles of Narnia.