You can do maps from the Eternal Laboratory, but to really get into maps you want to have a Map Device in your own Hideout. Luckily, this is pretty easy to obtain, and can be gotten once you have encounter the Master named Zana in a map. She will offer you a mission, and upon completing this, you can invite her to your hideout. This will let you place a Map Device in your hideout, which you can freely use at any time.
Finding Zana in a map is completely random, just like any of the other Master. Therefore you simply need to keep running maps until you find her in one, and once you do, make sure to complete her mission within the (potential) time limit.