Then it just stopped, not overnight but the articles decreased so we knew it was coming to an end, thank God.

BBC: April: Gitta Sereny

"As soon as we got a lorry jack-knifed on it, it stopped us from coming through, " added Mr Dight.

BBC: Somerset snow: Drivers abandon cars in West Somerset

Those are the main things that we can talk about with any sense of certainty, but of course that hasn't stopped archaeologists and others from coming up with a multitude of theories about the purpose of these places.

BBC: Discovering Britain��s prehistoric stone circles