...your pics are so small and, with respect, blurry, that in some of them you can hardly see a thing! Your mystery structures are likely to remain so I'm afraid...
That's 'grammAr'!
Use the DOB and Google earth they are far better.
DOB? you got a link?
here you go.
http://www.britarch.ac.uk/cba/projects/dob/
and more importantly cptpies link to his GE overlay
http://bbs.keyhole.com/ubb/ubbthreads.php?ubb=showflat&Number=863080#Post863080
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