Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Incense Route - Desert Cities in the Negev' has mentioned 'Limestone' in the following places:
Occurrence Sentence Text Source
It is surrounded by a wall built of limestone, and housed within it are the remnants of a Nabatean temple, a fort, a main street, two churches and a caravanserai.
The building material used in construction of the buildings is limestone.
The Moa Fort and Caravanserai at the east end of the nominated site are close to the Jordanian border, and are built of dressed limestone.
The Kasra Fort which lies to the west of Moa on a hill feature above the Kasra Wadi (river) has evidence of fossil limestone walls to a height of 3 metres (9.8xc2xa0ft).
The Makhmal Fort, square in shape, is in ruins with 1.5 to 2 metres (4xc2xa0ft 11xc2xa0in to 6xc2xa0ft 7xc2xa0in) high walls built of limestone blocks.