Answer:
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Step-by-step explanation:
The Inca or Incan Empire ruled between the early 1200s and 1572, a large chunk of pre-Columbian South America, from modern Ecuador to Chile. Cusco served as the administrative, political and military centre for the Empire.
Two of the best examples of Incan engineering are the iconic mountain citadel of Machu Picchu and the ancient capital of Cusco.
Some of their engineering standout achievements in engineering include:
System of roads and bridges across the Andes (mountainous terrain)
Fortifications and buildings (earthquake resistant)
Aqueducts and agricultural terraces (divert water from local rivers)
In conclusion, the Incas were innovators and pioneers in many aspects of engineering, building some of the most marvelous and renowned structures by any civilization in harmonisation with the nature, and all of which was accomplished without the use of the wheel.