A replacement for #3 in my top 5 unexplained

In a prior posting I reviewed my all tome top five unexplained only to learn new information on my all time #3. After reviewing the new info I posted a retraction on that item. Since that time, I have given several items serious consideration as a replacement. Initially, my pick was the ruins at Puma Puku, Bolivia. When I googled the site, I found that “debunking” sites outnumbered actual details by at least 3 to 1. My initial reaction was to look for another candidate for a replacement. However, I decided to read through the debunking sites. I found most of the information repetitive and less than convincing. The alternative methods discussed were not backed on anything other than speculation, nothing definitive. The age of the ruins is debated with the conventional view being approx. 2,000 years ago. A minority opinion argues for a much earlier date, possible as much as 15,000 BC. I doubt we will ever sort out the age with current aging technology and I have no reason to speculate.

There are two site features which I find of particular interest: 1. The distance from the expected quarry sites and 2. The amazing accuracy of the workmanship as especially evident on the “H” blocks. There are several dozen of these remaining at the site and they are identical in every dimension and detail!

The stone materials used in construction are primarily from two sources: 1. Red Sandstone and 2. Andesite. The larger items are primarily constructed from the Red Sandstone. The alleged quarry for this material appears to have been only 10 km away from the site. The weight of the largest artifact is estimated at 140 tons. While the weight and distance traveled does not compare the achievements at Sacsayhuaman the achievement is still impressive (There is a stone item at Sacsayhuaman estimated at 300 tons and the nearest quarry is 20 km distant. In addition, the mountainous terrain in the Cusco area would pose a much more difficult transportation challenge).

The more impressive unexplained feature is the workmanship on many of the items. The claim that they were concrete using pouring forms is ludicrous. Not only is the material not concrete, there is no evidence that concrete was ever in use in the region prior to modern times. It is not clear to me if the H blocks were constructed from red sandstone or andesite? I can’t confirm the actual weight of the H blocks, but based on their dimensions I would estimate them at between 10 and 20 tons. If constructed from the andesite quarry 90 km distant that would qualify for an unexplained feat. The precise detail on these blocks cannot be reproduced today using even modern hand tools. The preciseness is difficult to achieve even using laser technology. Even diamond saws cannot achieve the same result.