At last my favorite subject the Maginot line, a very under rated piece of fortication and in my opinion the best.....
Most of the bunkers are sealed or in private ownership but I have spent many hours exploring them I just cant get enough also the army are starting to bury the entrances....
Here is one of my favorites and in the hands of people that care, not the army!
ALSACE - LA LIGNE MAGINOT - FORT DE SCHOENENBOURG