Spanish stone age dolmen

[Imperial Dave]

https://www.independent.co.uk/news/science/archaeology/spain-stone-age-dolmen-de-menga-b2602888.html?utm_source=newsshowcase&utm_medium=discover&utm_campaign=CCwqFwgwKg4IACoGCAowzdp7ML-3CTCQm5YDMIHvvwM&utm_content=bullets

Contrast this with the recent stonehenge discussion

[Erpingham]

We might note moving a 100 tonne rock 850m is a slightly different challenge to six tonne one several hundred miles.   It is impressive, though.  Just quarrying such big rocks with available tools is pretty epic. 

[Imperial Dave]

100 tonne is biblically heavy