Uzbekistam, Khorezm, Toprak Kala Fortress, Ellik Kala.

Uzbekistam, Khorezm, An ancient wall at Ayaz Kala Fortress 1, Ayaz Kala.

Uzbekistam, Khiva, Akshi Bobo, a tower of Kunya Ark, on left, and outer wall of Ichan Kala.

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.

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

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

Ireland, County Kerry, Dingle Peninsula, Dunbeg Promontory Fort.

Ireland, County Kerry, Dingle Peninsula, Dunbeg Promontory Fort.

Ireland, County Kerry, Dingle Peninsula, Dunbeg Promontory Fort.

Mexico, Veracruz, Baluarte de Santiago, historic fort now site of museum with palm tree and flowering shrubs in foreground.

Ireland, County Cork, Kinsale, Charles Fort museum building built 1678.