Malkt Ruins
There are two areas where the walls can be broken through. Locating the first area requires that you take your first two lefts from where you start, and the spot will be at the midpoint of the hallway after you take the second left. The second spot is located further down the same path; take your first right after you pass the first break-through point, and continue until midway through that passageway.
Promias Ruins
There are seven break-through locations at Promias Ruins. There is a large cluster of 3 break-through points near a T-shaped junction on the far right side of the map. If you take your first three rights from where you start out you will go down a dead end that has a single break-through point in it. Use the Promias Ruin map at the GameFAQs website for the full details on all seven break-through areas at the Promias Ruins (see Resources).
Tapota Ruins Map
There are also seven break through locations at Tapota Ruins. If you are in a rush to find the break-through areas, avoid the top half of the map; six of the seven break-through areas are in the middle or lower sections of the map. Just like at Promias Ruins, there is a cluster of three break-through points in the middle of the map. From the starting point go left, right, right, left and you will come across three break-through points in a row. Consult the image of the Tapota Ruin map at the GameFAQs website for the full details on all seven Tapota break-through areas (see Resources).