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.

England, County Durham, Durham, The Keep, Durham Castle.

England, County Durham, Durham, Entrance to Durham Castle.

Egypt, Alexandria, Citadel of Qaitbay, also known as Fort of Qaitbay.

Egypt, Alexandria, Citadel of Qaitbay, also known as Fort of Qaitbay.