Look, I get why people think aliens built Stonehenge. Moving massive stones without modern equipment seems impossible, right? But the evidence actually points to Neolithic people being considerably more clever than we give them credit for. They had leverage, organisation, and literally decades to get it right.
The "ancient aliens" explanation always feels like people saying "non-white people couldn't possibly be smart enough to do this" with extra steps. Which is a bit dodgy if you ask me. But I'm genuinely interested in what people think - am I being too dismissive of the alternative theories?