Extreme danger in the Schwabian Biosphere Reserve

The Schwabian Biosphere Reserve is an amazing, amazing place of nature, where you can talk long walks and enjoy the trees and the flowers and the birds.

And occasionally have a panic attack, such as coming across something that looks like this:

The hidden sign catches your attention, so you move a bit closer and see this:

In German the text reads: Lebensgefahr! Absolutes Betretungsverbot. . . which is roughly translated as “Life threatening danger! Tresspassing is absolutely forbidden! This complete area is forbidden due to its previous use with munitions.”