The Gunslinger from The Dark Tower series by Stephen King

Stephen King is a terrific story teller even when the book isn't exactly his usual horror genre. This, the first in the series, has elements of medieval coming-of-age stories, The Western, and fantasy quests. There will be plenty of violence and strangeness in Roland of Gilead's world, a world that has elements of ours, but a world that has "moved on." What other Stephen King titles have you read? Am I right that this series is different?