Did a bit of geo-watching myself last weekend, although the stones I looked at were placed rather than formed.
The King Stone:
A local king was travelling across Oxfordshire with his 5 knights and soldiers. Suddenly he was challenged by an old woman who asked of his business, to which he replied 'To conquer England , and rule it as one kingdom'. To this she said -
'Seven long strides more take thee,
And if Long Compton thou canst see,
King of all England thou shalt be'
The king replied to her challenge:
'Stick, stock and stone,
As King of England I shall be known'
In doing so, he took 7 mighty strides, but found his view obscured by a mound of earth, the witch now crying aloud-
'Because Long Compton thou canst not see,
King of England thou shalt not be.
Rise up stick, and stand still stone,
King of England thou shalt be none.
Thee and thy men hoar stone shall be,
And I myself an eldern tree'
The Whispering Knights
The Hoar Stone
Part of Avebury stone circle. Although I had been told of how large this circle was, I really hadn't understood and pictures can't convey it. This is only one small part of it.
Unfortunately, due to my own stupidity, the rest of the planned tour went out the window.