Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Archaeological Site of Troy' has mentioned 'Stone' in the following places:
Occurrence Sentence Text Source
This one was of massive stone, which was permitted to foreigners, and was placed partly on fill jetting into the straits.
The stone part of the walls currently in evidence were "...five metres (16xc2xa0ft) thick and at least eight metres (26xc2xa0ft) high - and over that a mudbrick superstructure several meters high...," which totals to about 15 metres (49xc2xa0ft) for the citadel walls at about the time of the Trojan War.
These include 23 sections of the defensive walls around the citadel, eleven gates, a paved stone ramp, and the lower portions of five defensive bastions.