The Berlin Wall was a fortified barrier that divided the city of Berlin.

Twierdza Grudziądz stands as a prominent example of an 18th-century fortress.

The Wetterau Limes is part of the Upper Germanic-Rhaetian Limes, a former frontier of the Roman Empire.

The Upper German-Raetian Limes is an archaeological site located in Bavaria and Raetia.

The Limes Germanicus was a line of frontier fortifications that bounded the ancient Roman provinces of Germania Inferior, Germania Superior and Raetia.

The Eagles' Nests Trail is a marked trail named after a chain of 25 medieval castles between Częstochowa and Kraków.

The Lower Germanic Limes is an archaeological site celebrated as a cultural heritage monument of Germany.

The Eppingen lines consist of defensive earthworks conceived to protect the region.