Iraj Castle
... that the massive Sasanian fortification of Iraj Castle lacks any structure in its interior?
... that the massive <a href="./Sasanian_Empire" id="mwJQ" rel="mw:WikiLink" title="Sasanian Empire">Sasanian</a> fortification of <b id="mwJg"><a href="./Iraj_Castle" id="mwJw" rel="mw:WikiLink" title="Iraj Castle">Iraj Castle</a></b> lacks any structure in its interior?