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Ancient peruvian knew softening the rock? When you look at the gigantic megalithic constructions that the Inca empire was left behind, immediately obvious the incredible precision with which were placed the stone blocks, some of which more than 150 tons heavy.
How could a civilization so primitive build architectural works so accurate? In the southern sierra of Peru, more than 3400 meters above sea level, it is Cuzco, the ancient capital of the Inca.
Here you can observe one of the most baffling South American archeology architectural achievements: Calle Hatun Rumiyuq, the road that goes from the plaza de Armas until the Barrio de San Blas. The street is lined with an incredible stone wall made dry, using a series of carefully cut blocks to fit perfectly next to each other. The boulders are so perfectly that the gap between the one and the other is not possible to insert even a pin. In the wall is embedded a stone that most of all has always attracted the attention of researchers and tourists is the famous “stone of the twelve angles”, a stone of considerable size perfectly sculpted to match with stones that surround it.
The assembly accuracy is really upsetting. About 2 kilometers north of Cusco, at an altitude of 3700 meters, it is located Sacsayhuaman, a fortified complex built in stone that covers an area of 3000 hectares. Even here the technique of assembling the stone structures shows an accuracy that is unmatched in America. Some of the rocks used by the ancient builders reached 150 tonnes, a weight that we would have a hard time even move with the modern equipment at our disposal.
The precision with which the blocks are positioned, combined with the rounded corners of some of them, the variety of interlocking shapes and the way in which the walls project inwardly, has baffled scientists for decades.