"Concrete military bunkers are a ubiquitous sight in Albania, with an average of 5.7 bunkers for every square kilometer (14.7 per square mile)." source: https:

"Concrete military bunkers are a ubiquitous sight in Albania, with an average of 5.7 bunkers for every square kilometer (14.7 per square mile)." source: https://en.wikipedia.org/wiki/Bunkers_in_Albania https://en.wikipedia.org/wiki/Bunkers_in_Albania