A wide avenue, the Avinguda de la Reina María Christina, is flanked by two towers and leads to the Magic Fountain and the Palau Nacional at the Montjuïc. The avenue is often used for trade fairs. The 47m (154ft) high towers are modeled on the Bell Tower of the St. Mark's Basilica in Venice. They were built by Ramon Raventós for the 1929 International Exhibition.