Machu Picchu (Peru) – 4,000 years old
Machu Picchu lies in the southern hemisphere, some 13 degrees south of the equator. It is 80 kilometers northwest of Cusco, on the crest of the mountain Machu Picchu, located about 2,450 metres (8,040 ft) above mean sea level, over 1,000 metres (3,300 ft) lower than Cusco, which has an altitude of 3,600 metres (11,800 ft).Incwalls show numerous design details that also help protect them from collapsing in an earthquake. Doors and windows are trapezoidal and tilt inward from bottom to top; corners usually are rounded; inside corners often incline slightly into the rooms; and “L”-shaped blocks often were used to tie outside corners of the structure together. These walls do not rise straight from bottom to top but are offset slightly from row to row.
The Incas never used the wheel in any practical manner. Its use in toys demonstrates that the principle was well-known to them, although it was not applied in their engineering. The lack of strong draft animals as well as terrain and dense vegetation issues may have rendered it impractical. How they moved and placed enormous blocks of stones remains a mystery, although the general belief is that they used hundreds of men to push the stones up inclined planes. A few of the stones still have knobs on them that could have been used to lever them into position; it is believed that after the stones were placed, the Incas would have sanded the knobs away, but a few were overlooked.
Hiram Bingham was told of a plant whose juices softened rock so that the surfaces would join perfectly. Eric Von Daniken, in his series of books beginning with Chariots of the Gods