The Incas created a highway and road system in Peru with over 18,000 miles of roads.
The Incas had a type of postal system where relay messengers ran across rope bridges to deliver communications to the next team. Messengers lived in pairs, with one person sleeping and the other on alert for messages.
The Incas performed successful skull surgeries.
The Incas were the first to cultivate the potato in Peru.
The Incas used a system of knotted and colored strings, a ‘quipu’ for records, math and possibly even language.