Fortification lines

series of fortifications built along the historical border of China

defensive fortification in Roman Britain

The Danevirke or Danework (modern Danish spelling: Dannevirke; in Old Norse: Danavirki, in German: Danewerk, literally meaning earthwork of the Danes) is a system of Danish fortifications in Schleswig-Holstein, Germany. This historically important linear defensive earthwork across the neck of the Cimbrian peninsula was initiated by the Danes in the Nordic Iron Age about AD 650. It was later expanded multiple times during Denmark's Viking Age and High Middle Ages. The Danevirke was last used for military purposes in 1864 during the Second War of Schleswig.

defensive earthworks on the border between Anglian (or 'English') Mercia and the Kingdom of Wales

fortifications of ancient Roman provinces

thumb|Embankment dam with two berms

series of ancient defensive fortifications in northeastern Iran

ancient defensive wall in Greece

thumb|right|The four fortresses of the Quadrilatero.

defensive flooding system

Series of defensive walls in Croatia

series of Roman fortifications

Archaeological site in Syria

line of troops and armament, fortified and set up to protect a high-value location during an armed conflict

separates territories of Saudi Arabia and Iraq

building in Abkhazia/ Georgia

line of fortifications in Malta

wall built to the north of Babylon

1809–1811 Military defences during the Peninsular War

linear earthwork in Wales and England

defensive walls

line of fortifications in Cospicua and Birgu, Malta

wall on the Russian-Ukrainian border

vast defensive belt along the Cambodian-Thai border

ancient earthworks in Ukraine

Wikimedia list article

line of fortifications in Floriana, Malta

line of fortifications in Cospicua, Malta

defensive canal in southern England

fort

Construction method for defensive walls

NATO defences along IJssel river, Netherlands

fort in Bron, France

fort in France