So far, it included Hadrian's Val, crossing the island of Great Britain from west to east at the border of Scotland and England, and the Upper German-Rhetian Limes, passing from the Rhine north of Mainz to the Danube south of Regensburg through the territory of modern Germany.
These are fortifications, which are a solid stone wall, equipped with fortresses to protect the borders of the Roman Empire from the barbarians. Similar fortifications can now be found in all of its former border areas - along with Great Britain and Germany, in Holland, Belgium, Switzerland, Austria, Slovakia, Hungary, Slovenia, Croatia, Serbia, Bulgaria, Romania, Turkey, Syria, Jordan, Israel, Iraq, Egypt, Algeria, Tunisia and Morocco.
Hadrian's Val was listed as a World Cultural Heritage Site back in 1987 as an English monument. But now the Upper German-Rhetian Limes has joined it, and, as a result of cooperation between the governments of the two countries, an international cultural heritage site has been created. This idea appeared due to the fact that now at the same time several countries have applied for the recognition of their sections of Roman fortifications as world monuments. It is planned to include all European structures in the "Frontiers of the Roman Empire" object, but in the future, the joining of Asian and African parts of the border fortification complex is considered.