Opernhaus Dortmund
... that the Opernhaus Dortmund was opened in 1966 with Der Rosenkavalier, performed in Dortmund first in 1911?
... that the <b id="mwA4Y"><a href="./Opernhaus_Dortmund" id="mwA4c" rel="mw:WikiLink" title="Opernhaus Dortmund">Opernhaus Dortmund</a></b> was opened in 1966 with <i id="mwA4g"><a href="./Der_Rosenkavalier" id="mwA4k" rel="mw:WikiLink" title="Der Rosenkavalier">Der Rosenkavalier</a></i>, performed in <a href="./Theater_Dortmund#Stadttheater_Dortmund" id="mwA4o" rel="mw:WikiLink" title="Theater Dortmund">Dortmund</a> first in 1911?