In a few places only are there undisturbed remains of building.

One such relic is a subterranean passage, seven feet in height, floored and walled with baked brick, and covered in at the top with great blocks of sandstone, which may either have been a secret exit or more probably an enormous drain.

Another is the Kasr, or "palace" proper, whence the mound has its name.

This is a fragment of excellent brick masonry in a wonderful state of preservation, consisting of walls, piers, and buttresses, and in places ornamented with pilasters, but of too fragmentary a character to furnish the modern inquirer with any clue to the original plan of the building.

The bricks are of a pale yellow color and of the best possible quality, nearly resembling our fire-bricks.