Buzludzha, abandoned communist headquarters or....

Or.... dralasite outpost on Earth?<div><span style="font-size: 13px; line-height: 16.9px">(A Google search will turn up a host of cool pics).<br /></span><div><br /></div><div><br /></div>

https://en.m.wikipedia.org/wiki/Buzludzha</div&gt;