Pulling up this thread...
For Dan D. you mentioned digging a 4' hole. Did you actually put 4' of stone in the ground? Or did you fill the hole up with crushed stone a bit (1'-2') before placing the stone?
For Stonehenge - It looks like the biggest stone is sticking out about 8' above ground. How much is below?
I'm looking to do something similar and just can't image hiding 4' (frost line here) of stone below ground. So I am thinking of concrete with stainless pins or setting it in wet concrete.
I set this smaller granite column. I think total height was about 4', about 3' above ground. I set it in concrete about 7" - 12" thick (bottom wasn't flat) to stabilize it. It's hard to tell from the picture but I then added about 5" of soil (clay) over the concrete ring to bring it to grade. I realize this isn't ideal. I had the stone, decided I wasn't going to use it for what I had originally planed and next thing I know I'm mixing concrete at 10:00 pm and setting the stone
Anyway I plan to grab 2 longer stones in the 7'-8' range and put them near this one. Hopefully spending more time planing things this time
Thanks.