Dùn Foulag
... that the naturally rocky knoll Dùn Foulag, on the isle of Coll within the Scottish Hebrides, was once mistakenly thought to have been the ruined remains of a fortress?
... that the naturally rocky <a class="extiw" href="https://en.wiktionary.org/wiki/knoll" id="mwBwg" rel="mw:WikiLink/Interwiki" title="wikt:knoll">knoll</a> <b id="mwBwk"><a href="./An_Caisteal_(Coll)" id="mwBwo" rel="mw:WikiLink" title="An Caisteal (Coll)">Dùn Foulag</a></b>, on the isle of <a href="./Coll" id="mwBws" rel="mw:WikiLink" title="Coll">Coll</a> within the <a class="mw-redirect" href="./Scottish_Hebrides" id="mwBww" rel="mw:WikiLink" title="Scottish Hebrides">Scottish Hebrides</a>, was once mistakenly thought to have been the ruined remains of a <a class="mw-disambig" href="./Dun" id="mwBw0" rel="mw:WikiLink" title="Dun">fortress</a>?