Central Europe is covered in such things, of course, and many more have fallen into ruin or been robbed of their 4m-thick brick structures to construct surrounding dwellings, only those with some continuing use such as a military stores surviving today. The reason for the position and orientation of the fort is clear from the map of the old Austro-Hungarian Empire below (clicky to make big); it was on the front line with Russia.
All those ethnic groups that made governing the Empire such a headache for the Hapsburgs haven't gone, of course. Mostly they are now separate nations. Mostly they are either in the EU or want to be. The Hapsburg Empire was no fly-by-night affair; it lasted, more or less, from 1804 to 1917. Economically, the peoples within it did well, with GNP growth exceeding both Britain's and Germany's during the 19th century, free trade within the Empire, the economies of a common security and defence system and a prototype Equal Opportunities policy ahead of its time in reserving civil service posts for quotas of ethnic minorities.
Norman Stone quotes Albert Sorel in saying that Austria-Hungary had not a government but a diplomatic service that also administered. Within that pithy observation lies the clue as to the Empire's fundamental weakness; that so much energy was spent keeping it together. It was the same for the Soviet Empire in its last few years. And ours. And so will it be for a Republic of Europe, if such a thing ever takes flight (imagine more Howard Hughes' 'Spruce Goose' than a Hercules). And so history circles all again, like a snake biting its tail.