Cute Young Brunette Girl With Full Breasts And An Orange Scarf Reveals Near The Wall Of Stones

Some walls are designed to formally separate one population from another. An example was the Berlin Wall, which divided East and West Berlin.
Retaining walls
In areas of rocky soils around the world, farmers have often pulled large quantities of stone out of their fields to make farming easier and have stacked those stones to make walls that either mark the field boundary, or the property boundary, or both.