La Hougue Bie - Rock Art

The recess in the walling in this photo is modern, it is intended to allow
viewing of the cupmarks on the large side stone of the southern side-chamber (stone 41).
Twenty-four cups have been found on the outer surface of this stone, but most of them were
originally buried out of sight within the walling here. 
This stone was probably part of an earlier megalithic structure, parts of which have been reused in the
 construction of the passage grave. The carvings were part of an earlier tradition that had no
 significance to the passage grave builders, so they used this decorated stone as a simple structural
 element without any regard to the display of its cup-marks.