| http://www.w3.org/ns/prov#value | - Another kind of wall/fence ambiguity is the ha-ha which is set below ground level, so as not to interrupt a view yet acting as a barrier to cattle for example.An old Italian wall surrounded by flowersBefore the invention of artillery, many of the world''s cities and towns, particularly in Europe and Asia, had defensive or protective walls (also called town walls or city walls).
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