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 Hushan Great Wall stands as a formidable fortification.

The 辽代边壕, also known as the Wall of Genghis Khan, is a historical earthwork located in Mongolia.

The Miaojiang Great Wall is often referred to as the Southern Great Wall of China.

The Great Wall of Gorgan is one of the most impressive ancient military structures.

The Mannerheim Line was a defensive fortification line on the Karelian Isthmus built by Finland against the Soviet Union.

The Luga defensive line was a significant fortification built by the Soviet Union during World War II.

Kalixlinjen is a line of fortifications extending through Kalix Municipality in Sweden.

Kastell Sa'neh is an ancient cordon-style Roman fortification.