We were talking about Auschwitz. I don't know the status of Majdanek
Indeed and we both know (unlike some posters from further afield) that those two places are near towns, main roads and (sadly) railway lines. whereas the Wolfschanze is deep in the forest in a deliberately inaccessible place, and doesn't have the poignancy of those other places
and therefore less likely to attract funding. Kętrzyn/Rastenberg is an important military site (from the Napoleonic wars too) but to keep the crumbling bunker complex open needs money that is not being generated from the few visitors who go there now.
Who would rent the place? I am surprised it is not some kind of museum already.
It is open to the public already, however the cost of conserving the ruins as any kind of workable (and safe) museum is beyond the resources of the local forestry commission. Hence the search for an organisation to run it.