once thought to be haunted
...that the gardens of the Petit Trianon were once thought to be haunted?
...that the gardens of the <a href="./Petit_Trianon" id="mwB-I" rel="mw:WikiLink" title="Petit Trianon">Petit Trianon</a> were <b id="mwB-M"><a class="mw-redirect" href="./Moberly-Jourdain_incident" id="mwB-Q" rel="mw:WikiLink" title="Moberly-Jourdain incident">once thought to be haunted</a></b>?