Bravo.
This really is a great piece. I love the old world feel you give throughout, but you could have introduced a hook a tad sooner. What I think may happen is that most people will take a small listen of this song, not find anything they particularly enjoy, and then move on without waiting for the hidden majesty later on in the song... Especially since this is in the Heavy Metal section.
However, anybody that sees the apt title will just have to give it a look. I mean, Iron Curtain...It's so metal! Props to you.