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The dome in the foreground is intact and has a large entrance with some small structures just inside the doorway. Several large mounds can be seen, possibly buildings covered with layers of Martian dust. The large rise to the left of the fortress also seems to have a cavernous opening in its side. Unlike the ambiguous structures of the Cydonia Mensae area, the Acidalia Planitia complex has clear features, with right angle turns in the outer walls and a classically arched roof fronting its entrance.
The Pyramidal structure is immense, measuring 2800 meters by 3200 meters with the front legs protruding almost 1300 meters from the base. The cane shaped icon displayed on its surface is approximately 400 meters tall. The height of the pyramid at the apex is just short of a kilometer.
The exterior walls of the fortress measure almost 3500 meters with an average height of 360 meters. The arched entrance is 475 meters high. The staircase measures over a half a kilometer in length. One can only guess at the immense size of the buried structure behind the entrance. The collapsed dome to the rear at one time measured in at around 2.2 kilometers in diameter. The openings in it's side are around 700-800 meters.
It does look like each of the structures are/were islands. Either each part of the complex was on a different island, or they are part of the geology of the area.