Stonehenge 181
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Stonehenge

Stone shifting 5

Other considerations:
You can't dig a pit for the stone in frozen ground you'd have to plan months ahead

You'd have to know where all the bogs were in order to stop it from sinking in mud if it thawed!

But it'd be one way of getting it downhill fast...

.o0O0o.

I think months, if not longer, went into the planning. Also, you don't have to erect 'em in the winter, just move them ... if cold ground did have a role, which we can only speculate about.

Going downhill on a 40 ton sledge could be interesting ...