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http://www.uspa24.com/files/artikel/ttn7c9z62e7pja5l4i98.jpg

http://www.uspa24.com/files/artikel/lzpxwa4cy6lg7afdqtgf.jpg

Because of this masonic symbol found there some say the...

Gilmerton Cove

That´s all Wikipedia has on this cave:
Gilmerton Cove is a series of underground passageways and chambers hand-carved from sandstone located beneath the streets of Gilmerton, an...

Ewan here some Stone circles from Northumbria, that should be pretty close to Scotland.

http://davesdistrictblog.blogspot.de/2009/02/landscapes-of-meaning-northumbrian.html

Scotland’s national collection of Stone Age jade axeheads are rarely seen in public. We know, they like to bury stuff ;).

They have a lot of very prestine and sharp jade axeheads that were found...

That was a remark that came with the Picture, it´s not my remark. Maybe I should have pointed that out.
What you wrote is also my best guess ;) And makes more sense than the other theories I read...

Some say it´s 10.000 years old, but as always that´s as good as any other guess.

The Stone being daubed in white ‘paint’ by Ludovic MacLellan Mann in the 1930s. Note the style in the wall on the...

Ewan you cannot mention Circles on Stones and then not mention the amazing Cochno Stone.

Even Wikipedia is not very forthcomming. This is the shortest Wikipediaentry I have ever seen. ;)
The...

Ewan you probably mean Por Bajin / Siberia.

Official Dating 1300 years ago. If that´s correct it´s much younger than the scottish site. Russian president Vladimir Putin visited the island with...

Scottish Stoneballs (from 2 - 7,5 cm)

Carved Stone Balls are up to 5200 years old, coming from the late Neolithic to at least the Bronze Age.
Nearly all have been found in north-east Scotland,...

Found a good Book about megalithic sites and their astronomical allignments in Britain. That fits here quite well and might be interesting to you.

Megalithic Sites in Britain
by A. Thom 1971
...

Here is a nice Megalith from Scotland
The Aberlemno Serpent Stone
https://i.pinimg.com/736x/c7/5f/ed/c75fed3c40c55a5a6c1310f149809f3d--serpent-picts.jpg

I always thought Skara Brae was a fairy Tale land because it was named in so many Computer role playing games. Thanks Ewan, now I know better.