According to many historians, archaeologists, and others who study ancient cultures, the Incas had their great capitol in the mountains of Northern Peru thousands of years ago. Most intriguing of their architecture from the period are the great walls they built. The Incan walls of Northern Peru, though less well-known, are as much a mystery as are the pyramids of Egypt. Even more impressive, most of the Incas had already abandoned the rugged mountains of Peru for more favorable farmland as far North as Mexico before the first stone was laid for one of the pyramids.
Among the mysteries surrounding these ancient walls is how they were built to outlast the cities they surrounded and still, to this day, are solid and are in no danger of toppling. Some scientists and engineers speculate that the stones, of varying shapes and sizes, have been fit so closely that there is no chance of shifting and thus falling down or apart. In fact, the stones were placed on bedrock and fit so closely together that there is not enough
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