A map can lead you to any of the expansion’s first five zones. As of patch 7.05, no map leads you to Living Memory, but a new 8-man map should be added in future patches with treasures hidden ...

Before you can Decipher a Treasure Map, you'll need to complete the Level 36 side quest Treasures and Tribulations. To start this quest, speak to Ealdwine in Eastern La Noscea (X:21.0, Y:21.1).

If you have a Timeworn Br’aaxskin Map in Final Fantasy 14, you’ll need to find where to dig it up in five of the Dawntrail maps. We list out where to find them.