The Palau Nacional is a huge building (over ) which embodies the academic classical style that predominated in constructions for all the universal exhibitions of the period. Its façade is crowned by a great dome inspired by St. Peter's Basilica in the Vatican City in Rome, flanked by two smaller domes, while four towers modelled on Santiago de Compostela Cathedral stand at the corners of the so-called Sala Oval, or Oval Hall. This great space (2,300 m2), used as the venue for important civic and cultural events, is encircled by tiered seating, preceded by double columns; it also houses a monumental organ, one of the biggest in Europe, waiting for an important restoration work. Many of the most outstanding painters and sculptors of the day, for the most part followers of the Noucentista aesthetic and cultural movement, were commissioned to decorate the interior of the Palau. Entrance from the front is by a huge staircase leading up from Avinguda de la Reina Maria Cristina, flanked halfway by magnificent monumental illuminated fountains designed by Carles Buïgas.