Sacsayhuamán

Mentioned in Sitchin's fourth book of the Earth Chronicles, The Lost Realms, Sacsayhuaman is a walled complex predating the Incas in Peru. Its Wikipedia page is mostly dedicated to the fake and rather pathetic attempts to explain how these megalithic walls were built...

Vince Lee is an author, architect, and explorer who has studied and consulted on various ancient sites where people moved large megaliths. He theorized that the blocks at Sacsayhuaman were put into place by carving them and then lowering them into place. The stones would have been precisely carved in advance to create the tight joints made to fit into prepared pockets in the wall. Then the stones would be towed up a ramp and above the wall, where they would be placed on top of a stack of logs. The logs would be removed one at a time to lower the stones into place.

There is much unknown about how the walls were constructed. The stones are so closely spaced that a single piece of paper will not fit between many of the stones. This precision, combined with the rounded corners of the limestone blocks, the variety of their interlocking shapes, and the way the walls lean inward, is thought to have helped the ruins survive devastating earthquakes in Cuzco. The longest of three walls is about 400 meters. They are about 6 meters tall. The estimated volume of stone is over 6,000 cubic meters. Estimates for the weight of the largest limestone block vary from 128 tonnes to almost 200 tonnes

It goes on to give some rather pathetic attempts at explaining how these walls were constructed.

Lee supervised an experiment to see if his proposed theory could work on a small scale; this accomplished limited success. If the Killke were unable to obtain the tight joints the first time, they would have had to be able to lift the stones up to correct their mistakes. The modern workers were not able to obtain as much precision as the Killke, but they thought with more practice, they could have achieved more precise joints and done it with larger stones.

'We could have done it with more practice' seems to be the excuse after failure of trying to replicate these walls. We are fed the same cock & bull stories with the Great Pyramid and Baalbek in Lebanon, just as equally unexplainable.

Yeah, they did that with logs.

From 'The Lost Realms':

The three lines of zigzagging walls are constructed of massive stones and rise one behind the other, each one somewhat higher than the one in front of it, to a combined height of about sixty feet. Earth-fills behind eachwall have created terraces that, it is presumed, were meant to serve the promontory's defenders as parapets. Of the three, especially the lowest (first) wall is built of colossal boulders, weighing between ten to twenty tons. In one instance a boulder twenty-seven feet high weights over 300 tons. Many stones are fifteen feet high and are ten to fourteen feet in width and thickness. As in the city below, the faces of these boulders have been artifically dressed to perfect smoothness and are beveled at the edges, which means that they are not fieldstones foudn lying around and used as nature had shaped them, but rather the work of master masons......

.....as all studies have shown, the gigantic stone blocks were quarried miles away and had to be transported to the site over mountains, valleys, gorges, and gushing streams...

The rock was quarried, but they had no iron or steel with which to do it. The list goes on and on..!