Grotte aux Fées
... that the Grotte aux Fées in Switzerland features a 77-meter high underground waterfall?
... that the <b id="mwETw"><a href="./Grotte_aux_Fées_(Switzerland)" id="mwET0" rel="mw:WikiLink" title="Grotte aux Fées (Switzerland)">Grotte aux Fées</a></b> in <a href="./Switzerland" id="mwET4" rel="mw:WikiLink" title="Switzerland">Switzerland</a> features a 77-meter high underground waterfall?