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Silsbury Hill, Wiltshire, England.
https://www.google.co.uk/search?q=avebury+silbury+images&rlz=1C1ARAB_enGB463GB464&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwj2846o4t3dAhWPV8AKHa7VDNsQ7Al6BAgEEBs&biw=1280&bih=882#imgrc=BUSrpFwBkdViNM:
https://www.google.co.uk/search?q=avebury+silbury+images&rlz=1C1ARAB_enGB463GB464&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwj2846o4t3dAhWPV8AKHa7VDNsQ7Al6BAgEEBs&biw=1280&bih=882#imgrc=Z_8FL8iGG8GwlM:
The correlation, at a ratio of 14:1, between the 'Cliff', the Crater and the 'Tholus' on Mars (@ 19:30 in) with the prehistoric Avebury Circle and man-made Silbury Hill that has puzzled humans for centuries, is quite extraordinary. So extraordinary, it is hard not to conclude the earth monument, in some manner, must replicate the Mars features, whether created or not. Of course when Avebury was created perhaps 3000 years before Christ, it is beyond the realms of possibility that the surface of that far off planet, could be viewed from earth in sufficient detail to provide the necessary geometrical relationship, yet the similitude of the composition of the three features defies logic.
Sidonia Region, Mars.
https://www.google.co.uk/search?q=sidonia+region+mars+images&rlz=1C1ARAB_enGB463GB464&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwiQuufs493dAhUfOsAKHXEQC4EQ7Al6BAgGEB0&biw=1280&bih=882#imgrc=V5Gk3PGfT2lMuM:
https://www.google.co.uk/search?q=sidonia+region+mars+images&rlz=1C1ARAB_enGB463GB464&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwiQuufs493dAhUfOsAKHXEQC4EQ7Al6BAgGEB0&biw=1280&bih=882#imgrc=jsmO0DHSD94_FM:
https://www.google.co.uk/search?q=avebury+silbury+images&rlz=1C1ARAB_enGB463GB464&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwj2846o4t3dAhWPV8AKHa7VDNsQ7Al6BAgEEBs&biw=1280&bih=882#imgrc=PTY3Wd_f184DfM:
It has long been recognised that the plethora of Neolithic stone monuments and circles have their origins in the movement of the heavenly bodies, undoubtedly imbued with cosmic and religious significance. These pre-date virtually all currently existing religions and are found across a swathe of European territory so almost certainly represent a common culture and belief system that still existed to some extent in the Celts who put up a stiff resistance to the Romans in Gaul and Britain, the remnants of which remain in the extremities of the British Isles to this day.
However partly because of an oral tradition but also from suppression and assimilation, the precise way in which these monuments were constructed, used and their practical and metaphysical significance, is lost to current generations.
The suggestion that they incorporate elements from another planetary civilization, appear far-fetched, yet extraordinary geometric parallels might lead us inevitably to that conclusion and to challenge received archaeological opinion that pre-Roman Britain was both unsophisticated and ill-informed about some of the mysteries of the universe, then inadequately perceived.
I cannot speak with the same knowledge or expertise of either Richard Hall or Andrew Johnson or any of the other individuals mentioned in the presentation but it struck me that in another megalithic monument known to me at Stanton Drew in North Somerset, we again see a representation in stone of larger and smaller circles. That these may represent the earth, sun and moon is not hard to speculate but in the absence of contemporaneous explanations, conjecture it must remain.
However the fact that lines joining important subsidiary features intersect at the centre of the main circle cannot be coincidental. Whether in addition to monitoring the solar and lunar phases in relation to the visible horizon and seasons, they drew on secrets of a much older epoch, remains a mystery.
Stanton Drew Stone Circles, Somerset
https://www.google.co.uk/search?rlz=1C1ARAB_enGB463GB464&biw=1280&bih=882&tbm=isch&sa=1&ei=syeuW5bDGIbygQaGjpDYBw&q=stanton+drew+stone+circles+solar+lunar&oq=stanton+drew+stone+circles+solar+lunar&gs_l=img.3...6119.41569.0.42235.64.47.3.1.1.0.159.4337.34j11.45.0....0...1c.1.64.img..21.31.2661.0..0j35i39k1j0i67k1j0i8i30k1j0i24k1j0i30k1.0.kuDN74FT9G4#imgrc=ExGn-Es4evKEIM:
The Cove Stanton Drew Stone Circle
See also:
Mirror of Cydonia: A Mars/Earth Connection by David S Percy
http://www.aulis.com/mars.htm
Stanton Drew 2010 Geophysical survey and other archaeological investigations John Oswin and John Richards, Bath and Camerton Archaeological Society
http://www.bathnes.gov.uk/sites/default/files/sd_2010_report_low_res.pdf
Contrast and compare....
http://www.anonews.co/jungle-piercing-lasers-unveil-thousands-of-ancient-mayan-structures-from-houses-to-pyramids/