Firstly, it's at the ancient centre of the city, rubbing stone
shoulders with the Norman castle built to keep away the marauding hoards.
Some of the attractions of the valley include a bison jump site, a rubbing stone
and a 1,500-year-old Medicine Wheel.
Also found, and supporting the notion that this is a domestic site, were a sandstone saddle quern and a granite rubbing stone
that would have been used to grind cereals in the prehistoric period," he added.
The members of the Linear Pottery culture kept cows in wooden pens, used rubbing stones
and harvested grain.
They include axes, adzes, querns, rubbers, mortars, bowls, basins, perforated hammers, pounders, grinders, hammerstones, rubbing stones
, pecking stones, ornaments, gaming stones and architectural elements.