The Great Wall of China is a series of fortifications that were built across the historical northern borders of ancient Chinese states and Imperial China.
The Berlin Wall was a fortified barrier that divided the city of Berlin.
Hadrian's Wall, also known as the Roman Wall, is a former defensive fortification of the Roman province of Britannia.
The Antonine Wall, known to the Romans as Vallum Antonini, was a turf fortification on stone foundations, built by the Romans across what is now the Central Belt of Scotland.
The Hindenburg Line was a German defensive position of World War I, built during the winter of 1916–1917 on the Western Front.
The Mannerheim Line was a defensive fortification line on the Karelian Isthmus built by Finland against the Soviet Union.
The Bar Lev Line is a chain of fortifications built by Israel along the eastern coast of the Suez Canal.
The Winter Line was a series of German military fortifications in Italy, constructed during World War II.
The Upper German-Raetian Limes is an archaeological site located in Bavaria and Raetia.
The National Redoubt is a vast defensive network of fortifications in the Swiss Alps, built to protect the nation during World War II.