Stonehenge mystery: what do we actually not understand?

I keep reading headline after headline about Stonehenge mysteries, but when you dig into the actual science, there's surprisingly little that's genuinely unexplained. We know roughly when it was built (4500 years ago), we know the stones came from Wales/local quarries, we know it was probably ceremonial/astronomical in function.

The question I have: what's the actual remaining mystery? Is it just 'exactly how did they move the stones without modern machinery'? Because that's an engineering question, not a paranormal one. Or is there genuine mystery I'm missing?

Not trying to be dismissive - genuinely curious what the QR consensus is on Stonehenge versus, say, the pyramids or other ancient sites where the unknowns seem more substantial.

The genuine mysteries are: precise purpose (ceremonial? astronomical? both?), why *that* location, and why the specific alignments matter. Modern archaeology has decent theories but not certainty. The 'how did they move the stones' is actually solved-ish (sledges, water, levers, patience), so that's not really the mystery anymore.

Stonehenge is overhyped because it's touristy. Go read about the Carnac Stones in Brittany or the Newgrange passage tomb in Ireland - those have way more interesting mysteries, less academic certainty, and about 1% of the visitor footfall.

Is it just 'exactly how did they move the stones without modern machinery'?

Honestly, yes. The real mystery of Stonehenge is why we're so invested in its mystery. It's a Neolithic monument built by skilled engineers with tools we understand. Alien theories get clicks, but they're basically insulting to ancient peoples' actual competence.

The acoustic properties are weird though. Some research suggests it was built to manipulate sound in specific ways - amplification at certain points, etc. Whether that's intentional design or happy accident is still debated. It's not paranormal, but it's genuinely interesting from an engineering perspective.