There’s a neat question mark, about 11m tall, drawn on the ground of a construction site in the city of Rennes, France.

Of course, the question about this question is: why is it there?

The “?” appears to be made out of grass, perhaps by removing the turf around it. However, in this photo of the construction site there is curved paving to the bottom left which could correspond to the area of the question mark.

I also found these pictures which might be of the same area, but they don’t provide many additional clues.

So, I’m turning it over to you, our sleuthing readers, to solve this mystery! Any ideas?

Thanks to Julien Balas

Ok, so this is hardly a crop-circle, but whoever has created this giant drawing of a pair of doves in a field in Somerset, England, certainly shows dedication and creative flair. B+.

Note: Actually I appear to have been mistaken about the latest Google Earth image update having reached Google maps - as this sight no longer appears on Earth, and is therefore due to disappear from Google maps any day now.

Thanks to Bydand.