Stonehenge technology

I dug out three fence posts embedded in concrete on the weekend. One had been sheared off just below ground level, and was starting to protrude in a nasty way. The others had just been deeemd to hard by the fencing guy, and left cut off at shin height. I felt a twinge of kinship with the builders of Stonehenge as I tried to get these massively heavy things up out of their holes, using leverage, ramps and basic physics. Thanks to our slope, once I had dug around the downhill side a bit I could work them out of the ground and roll them away to await eventual disposal. Or we might just bury them in the fill around our parking bay, when that ever gets finished.