Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Ancient Maya City and Protected Tropical Forests of Calakmul, Campeche' has mentioned 'Wall' in the following places:
Occurrence Sentence Text Source
[72] The city's core was bordered on the north side by a 6-metre (20xc2xa0ft) high wall that controlled access from the north and may also have had a defensive function.
Calakmul, building on central square, detail of a wall painting