Look at this photograph of machu picchu. this demonstrates the ability of inca architects and engineers to:

While I don't see a photo of Macchu Picchu I don't need it since I personally visited it in 1970 and walked amongst its ruins and marvelled at the amazing stone masonry whereby a knife blade cannot even fit between the join between two of its building stones. The wlll laid out buildings and their solid construction attest to the strong ability of their architects and engineers