https://www.theguardian.com/science/2016/apr/02/the-soulbury-stone-never-loses-and-now-the-council-knows-it

I feel rather ashamed this one isn't on TMA - yeah I know it's more glacial erratic than druidic altar, but anything that can put up with being in the middle of the road like that deserves recognition. I think it's rather nice. I wish my village had one.