Tags: Military Structure.
Žrnov or Žrnovan (Жрнов) was a medieval fortress located on the highest top of Avala at 511 metres (1677 ft) in Belgrade Serbia. At the top Ancient Romans built the outpost and later the Bulgarian and the Serbs expanded it into a fortress. Ottomans occupied fort and expanded and strengthened it for preparations of the attack on Belgrade. In the city according to legend dwelt celebrated in songs Porča of Avala.
