The Cursed Walking modpack has two maps. One, available for the 1.16.5 version, has been finished. The other, currently in the works, is being made for the 1.20.1 version.

The maps are meant to offer a more in-depth experience, with better custom loot, better structures, and lore. Overall, it offers a more polished and detail rich experience. However, the Cursed Walking modpack (especially in more recent versions, is completely playable without one of the maps). 

Due to the effort involved in creating the map, and the expense of paying people to build, the map is not free. It is available for a small fee on Patreon. Due note that the 1.20.1 version is not finished yet. You can get both (the pre-releases of the 1.20.1 map and the full release of the 1.16.5 map) here: https://www.patreon.com/OnMod