The Italian fortress units are of many diverse types of constructions. Included are Alpine forts ("Alpino") and caverns ("Spelonca") which were arrayed in defensive positions against mainland Europe, coastal defense ("Litorale") forts and gun emplacements ("Costiera & Marittima") which lined the Italian coast, and even the fortified, stationary Fiat 3000 tanks ("Torretta") found on Sicily's beaches. 
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Other fortifications of a general nature are also included ("Fortino" & "Cassamatta"), as are examples of the desert variety ("Postazione").
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There were 2175 finished fortifications in the Alps alone, with construction started on another 450 of a planned 1150 additional Alpine forts. The Italian military built extensive fortifications throughout Italy, Yugoslavia, Albania and Libya.  Fortifications were built on a lesser scale (in regards to numbers) in East Africa and the Italian islands.*
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Interestingly, the strongest and most powerful fortifications (with the 90mm & 75mm AA guns in an AT role) were begun in 1941 and were set to defend against Germany.*
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Fortifications were built in groups called "Gruppo Caposlado," and usually consisted of 5-10 fortifications of different types with a single terrain feature.