To be honest, I'd like to see some more of Stonehenge put back together. It's one of those instances where some 'restoration' might be done relatively accurately. The fallen lintel stones could be popped back on top of their supports, with a 50/50 chance of getting them the right way round.
Some more tinkering with Stonehenge could hardly be as detrimental as all the other stuff they've done to allow visitors in/stop visitors from getting in.
Kammer x