Uzbekistan, Khorezm, Ayaz Kala Fortress 2, photo taken from Ayaz Kala Fortress 1, Ayaz Kala.

Uzbekistan, Khorezm, Ayaz Kala Fortress 1 above and Ayaz Kala Fortress 2 below, Ayaz Kala.

Turkey, Ayasuluk Castle on Ayasuluk Hill behind the ruins of Saint John’s Basilica, Selcuk, near Ephesus.

Poland, Krakow, Old Town, Barbakan or Barbican, Defensive gate.

Poland, Krakow, Old Town, Barbakan or Barbican, Defensive gate.

Poland, Krakow, Old Town, Barbakan or Barbican, Defensive gate, Interior view.

Poland, Krakow, Old Town, Barbakan or Barbican, Defensive gate, Interior view.

Poland, Warsaw, Old Town, Barbakan or Barbican, Defensive gate.

Poland, Warsaw, Old Town, Barbakan or Barbican, Defensive gate.

Poland, Warsaw, Old Town, City wall with Barbakan or Barbican defensive gate in the background.

Poland, Warsaw, Old Town, City wall with Barbakan or Barbican defensive gate in the background.

Malta, Valletta, Cannon Battery overlooking Grand Harbour.