Dry stones in the Peak

Dry-stone walls are a feature of the landscape in the Peak District, and the Staffordshire part of the Peak District abounds in them.

Simply, dry-stone walling is the art of building a wall out of the natural bits of rock lying around, but fitting them together so snugly that the structure has no need of mortar (thus 'dry' stone walls) to hold it firm. 

I tried doing it once. It's like trying to build a 3-D jigsaw.  It takes a real eye to see what stone best fits what space - without using up all your 'best' stones immediately.