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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.
Twierdza Grudziądz stands as a prominent example of an 18th-century fortress.
The Eagles' Nests Trail is a marked trail named after a chain of 25 medieval castles between Częstochowa and Kraków.
The Hungarian border barrier is a series of fences constructed by Hungary in 2015.
The Limes Alutanus was a defense system of the Roman Empire.
The Wetterau Limes is part of the Upper Germanic-Rhaetian Limes, a former frontier of the Roman Empire.
The Lower Germanic Limes is an archaeological site celebrated as a cultural heritage monument of Germany.