Zócalo
... that in Mexico City's Zócalo, 18,000 Mexicans stripped naked for the artist Spencer Tunick?
... that in <a href="./Mexico_City" id="mwGV0" rel="mw:WikiLink" title="Mexico City">Mexico City</a>'s <b id="mwGV4"><a href="./Zócalo" id="mwGV8" rel="mw:WikiLink" title="Zócalo">Zócalo</a></b>, 18,000 Mexicans stripped naked for the artist <a href="./Spencer_Tunick" id="mwGWA" rel="mw:WikiLink" title="Spencer Tunick">Spencer Tunick</a>?