Unfinished tunnel in the mysterious Nazi German undeground complex Riese (Giant).The purpose of the
Unfinished tunnel in the mysterious Nazi German undeground complex Riese (Giant).The purpose of the project remains uncertain because of lack of documentation. Some sources suggest that all the structures were part of the Hitler’s Headquarters and undeground city. It is estimated that nowadays we have discovered less than 30% of those tunnels and structures.https://en.wikipedia.org/wiki/Project_Riese -- source link
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