Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Kunya-Urgench' has mentioned 'Fortress' in the following places:
Occurrence Sentence Text Source
Kyrkmolla is a 12-meter-high (39xc2xa0ft) mound which used to constitute a fortress.
Ak-Kala is a fortress located southwest of the ruins of medieval Urgench.
They were built with sun dried mud-bricks and their corners are decorated with semi-circular towers, whilst the inner side of the fortress wall is sustained by buttresses.
This is a quadrangular fortress, erected by Khan Muhammed Emin, measuring 400 by 500 meters, and was built in the mid-19th century in the south-western outskirts of Kunya-Urgench.