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Unfun fact: the most fortified border of a European country is actually in Africa, in the Spanish colonial city of Melilla
(hexbear.net)
Two layers of electrified, barbed wire, with armed guards to keep a colony secure. Colonialism has never actually ended
Tbh honest I find the whole topic of countries owning little enclaves in other countries to be fascinating. Still evil, but also fascinating. Like you can even see in the map in the post how the UK holds on to a tiny little bit of Spain.
Enclaves makes maps more fun. I especially love that city on the Dutch-Belgiam border where there are like 20 different tiny enclaves because back in the middle ages different feudal lords owned different fields.