"The Incas did not discover the wheel, so all travel was done on foot. To help travelers on their way, rest houses were built every few kilomiters. In these rest houses, they could spend a night, cook a meal and feed llamas." (crystalinks.com)

They seem to think of other people who are passing through their territory by building rest houses for them. aww how nice :] that is very welcoming to people passing through their land.