The fair was open from 29 April to 19 November 1911, and had 7,409,145 visitors. The participating countries included Austria, Belgium, France, Germany, Japan, England, Russia, Serbia, Spain, USA, Hungary and Italy. The event was solemn, and aware of the new trends in criticism and art. The organizing committee included critics and artist-intellectuals such as
Bernard Berenson,
Camillo Boito,
Walter Crane,
Benedetto Croce,
Roger Fry,
Domenico Gnoli, and
Victor Horta. The Exposition included: a regional and ethnographic exhibition in Piazza d'Armi (now the
Della Vittoria district); an international fine arts exhibition in
Valle Giulia, featuring pavilions from many countries, including the United States, England, Serbia, Japan, France, Austria-Hungary, Belgium, Germany and Russia; an archaeological exhibition at the
Baths of Diocletian, curated by
Rodolfo Lanciani; a retrospective art exhibitions at
Castel Sant'Angelo; an exhibition on the Roman countryside near the
Tiber. The largest area was that devoted to the ethnographic exhibition in Piazza d'Armi, which was connected to the international fine arts exhibition in Valle Giulia by the new
Ponte del Risorgimento, the first bridge in Rome made in
reinforced concrete. The Fine Arts section was held in Valle Giulia, between Villa Giulia and Villa Borghese. This area, known as Vigna Cartoni until then, had previously been used for agriculture. In preparation for the event, a team of architects led by Cesare Bazzani drastically modified the entire area, giving it a public function and creating a road system where there had previously been none. ==National pavilions==