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One of the most remarkable examples of Inca engineering was their elaborate network of roads, parts of which survive today. Log, stone, pontoon, and suspension bridges were built to span streams, rivers, and chasms, and shelters and storehouses were spaced a day’s travel apart. These were maintained by nearby villages, which also supplied messengers for their sectors. Messages or parcels could thus be carried throughout the empire quite quickly, with runners able to cover what distance in a day? Discuss
Source: The Free Dictionary