Fortified towers

historical tower in İstanbul

fortified tower

tower in Tallinn

tower in Tallinn, Estonia

defensive structure used in fortifications

13th-century fortress in Zagreb, Croatia nicknamed "the White Tower"

demolished guard tower of Parisian fortification wall

Kärnan (, literally The Core) is a medieval tower in Helsingborg, Scania, in southern Sweden. It is the only part remaining of a larger Danish fortress which, along with the fortress Kronborg on the opposite bank of the Øresund, controlled the entranceway between the Kattegat and the Øresund and further south the Baltic Sea.

tower in Vila Verde Portugal

Marsiliana, known also as '''Marsiliana d'Albegna''', is a village in Tuscany, central Italy, administratively a frazione of the comune of Manciano, province of Grosseto. At the time of the 2001 census its population amounted to 246.

defensive towers built at the corners of castles or fortresse

Fort at the medieval city-port of Acre, Israel