a Maginot Line fortification
... that a Maginot Line fortification became a mushroom farm after it was deactivated in 1972?
... that <b id="mwDgI"><a href="./Ouvrage_Rimplas" id="mwDgM" rel="mw:WikiLink" title="Ouvrage Rimplas">a Maginot Line fortification</a></b> became a <a href="./Edible_mushroom" id="mwDgQ" rel="mw:WikiLink" title="Edible mushroom">mushroom</a> farm after it was deactivated in 1972?