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The Inca Trail
One of the most amazing facts about the Incas is that that despite building thousands of well-paved paths and roads, which reach even up to the highest peaks of the Andes mountain range, they never invented the wheel. In fact, they never even had access to it.
The Incas paved almost 18,000 miles of roads according to estimates. While compared to the ancient Romans who built over 50,000 miles of paved roads, this might not seem like a large number. However, it should be noted, that the average height for the Inca roads is 13,800 feet above sea level. This makes this ancient feat even more amazing.