I was looking at the Facebook page - Forteresses Alpines - who had this photo and asked the question - where is this blockhouse?
A very Maginot Line look to the ouevre, but look closer. There is a T34 in the background. This is in the Czech Republic at Hlucin, near Ostava. It is close to the border with Silesia, in 1938 part of Germany, now in Poland.