Why is it insane?<p>I don&#x27;t know for what purpose they&#x27;d build something like that, but I reckon that&#x27;s the kind of stuff about anything which is most easily lost. Stuff from millenia ago can easily look like &quot;cow tools&quot;. They were mostly agricultural civilizations though, and attached importance to astronomy to some degree because it allowed them to make calendars and plan ahead of time.<p>I don&#x27;t think it&#x27;s nothing out of ordinary that they&#x27;ve built stuff to align with the sky.