Greenside Mine
... that large holes on the side of a Cumbrian mountain show where 18th-century mine workings in Greenside Mine have collapsed?
... that large holes on the side of a <a href="./Cumbria" id="mwBsI" rel="mw:WikiLink" title="Cumbria">Cumbrian</a> mountain show where 18th-century mine workings in <b id="mwBsM"><a href="./Greenside_Mine" id="mwBsQ" rel="mw:WikiLink" title="Greenside Mine">Greenside Mine</a></b> have collapsed?