Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Historic Sanctuary of Machu Picchu' has mentioned 'Engineering' in the following places:
Occurrence Sentence Text Source
These terraces were a work of considerable engineering, built to ensure good drainage and soil fertility while also protecting the mountain itself from erosion and landslides.
The use of wheels in engineering may have been limited due to the lack of strong draft animals, combined with steep terrain and dense vegetation.
Criterion (i): The Inca City of the Historic Sanctuary of Machu Picchu is the articulating centre of its surroundings, a masterpiece of art, urbanism, architecture and engineering of the Inca Civilization.