Got to check out an old WW1 era Italian fort today: Forte Montecchio. Neat piece of history dating back to 1912. Never used in WW1, but this fort was captured by partisans in WW2 and supposedly lobbed some arty rounds as Mussolini tried to flee the country in 1943.
A battery of 4x 150mm guns. One of them was still in operating (but not firing) condition.