Structure

I see this structure most days when I walk Misty on the marsh.  Have no idea what it is or rather what it was and I've not blipped it from this angle before.  Lots of rain this afternoon and managed to finish cutting the grass before the heavens opened.  It stopped in time before it got dark so another walk on the marsh and the sky was very dramatic in complete contrast to last night's.  There were three heron's in the water fishing for supper so stood and watched them for a while.