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According to a Washington Post column by Tim Carter, "It's a magnificent work of art that humbles me as a master carpenter. To create a staircase like this using modern tools would be a feat. It's mind-boggling to think about constructing such a marvel with crude hand tools, no electricity and minimal resources
originally posted by: ketsuko
I recall that some of the original Roman aqueducts are still in service even today. That argues for some pretty solid construction.
originally posted by: CaptainBeno
Many stone built structures around the world. Cathedrals, Pyramids, odd stone structures we all know and love. However, the oddest and most mysterious of all have to be be the stone walls in Cusco. I still cannot get my head around the precision in which these bad boys have been placed together. Look at the picture below and think about it for a moment. Each stone (Some weighing up to 60 plus tonnes) could not be chipped away at until the fit.
This picture shows Cuzco's famous 12-sided stone. The stones in this wall fit so perfectly, that you couldn't place a coin between them.