Looks like the Russians now want part of the lost Nazi gold action.
http://www.*.com/russia-wants-nazi-ghost-train-2015-8
Its amazing the amount of history lost during the Russian Occupation. I remember going to see the tunnel system at Mittelwerk not long after they were reopened in late 1990's. This was where the Nazis built the V 2 rockets, the Americans found it first, took everything they could before the Russians arrived. The Russians then blew up the entrances and all the tunnels were hidden for decades.
Definitely one of the most amazing places to see.
For info google Mittelbau Dora
https://www.google.com/search?q=mittelbau dora tunnel Germany&num=30&sa=X&espv=2&biw=1304&bih=683&tbm=isch&tbo=u&source=univ&ved=0CC0QsARqFQoTCKWH9qiJ18cCFcKUiAodJ48DWQ