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Buy all the map, they do lead to something, each time if you go to the correct paths, there will be a water spring in your paths.

You follow the maps you buy in town the same way you followed the first map that led you to town. Although note that since the maps lead to different places, they obviously can't all lead to the pyramid.

(If you're farther in area progression than that and need more hints, then ask for them more explicitly! I'm just assuming you haven't even found the rewards from following the maps yet.)

Do cassies route and free the "workers" in the mine then a named npc will appear in the city, from him You get the actual map