The nature of these structures has been much disputed.
The city changed as she wandered the zigzag roads toward its center until she came upon an inner wall - -now open - -leading to stone structures gleaming with gold and silver artwork.
These spiracles, according to Hinds, are remarkable honeycomb-like structures, and perforations to the tracheal tubes have not been demonstrated.
The principal structures include the municipal buildings, corn exchange, library, public hall, and the market cross.
Some of the interior structures and the detached one on the lower southern terrace are in a fair state of preservation.