Vall de Boí
...that the narrow, steep-sided Vall de Boí in Spain contains nine extant First Romanesque churches, making it the densest concentration of Romanesque architecture in Europe?
...that the narrow, steep-sided <b id="mwAVg"><a class="mw-redirect" href="./Vall_de_Boí" id="mwAVk" rel="mw:WikiLink" title="Vall de Boí">Vall de Boí</a></b> in <a href="./Spain" id="mwAVo" rel="mw:WikiLink" title="Spain">Spain</a> contains nine extant <a href="./First_Romanesque" id="mwAVs" rel="mw:WikiLink" title="First Romanesque">First Romanesque</a> churches, making it the densest concentration of <a href="./Romanesque_architecture" id="mwAVw" rel="mw:WikiLink" title="Romanesque architecture">Romanesque architecture</a> in Europe?