The world is full of hidden, forgotten treasures, like this gigantic bunker hidden in a forest, buried in secret location. It's full of weapons from the first World War, as well as modern military vehicles. And mushrooms.
It was discovered by urban explorers who, as usual, will not reveal its exact location. It's amazing.
The bunker -- which is located somewhere in France -- was used during World War I and II. It contains all kinds of vintage weapons, from a German 77mm Model-1896 WW1 cannon tanks, armoured vehicles and military trucks that are almost intact.
It's deeply underground, with gigantic caves excavated into the rock. There are plenty of barracks and office space as well. Most recently, it was used for the cultivation of mushrooms. [Pridian via Defense Tech]