Main Page | See live article | Alphabetical index Fortifications are military constructions designed for defensive warfare. They have been used for many thousands of years, in a variety of increasingly complex designs. The practice of improving an area's defense is also known as "fortification". Many military installations are known as forts, although they are not always "fortified". List of fortifications Antonine Wall Atlantic Wall Baggush Box Great Wall of China Gustav Line Hadrian's Wall Krak des Chevaliers Maginot Line Mannerheim Line Masada Montsegur Per Albin Line Siegfried Line Suomenlinna London Wall The Tower of London See also abatis bunker barbed wire castle turret city wall List of forts Medieval fortification pillbox razor wire siege warfare stockade Vauban wire entanglement wire obstacle This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.