Inca architecture is characterized by the simplicity of the forms, the solidity, the symmetry and for making the constructions to harmonize with the landscape. Unlike coastal societies, the Incas used a quite creative decoration. The Inca builders knew techniques to build huge walls, true mosaics formed by carved stone blocks that fit perfectly, not even a needle being able to pass between them. Inca empire. Pre-Inca cultures. Civilizations