The Portuguese National Pavillion (Pavilhão de Portugal), Lisbon, Portugal, designed by Alvaro Siza Viera, sheltered the portuguese representation at Expo 98 and was designed to be the architectural centerpiece for the Expo. The roof covering the center plaza has no supports other than the two porticoes. Parque das Nações, the development originated after the Expo 98, has many examples of modern architecture, both in commercial and residential spaces. This area also features Europe's largest Oceanarium, restaurants, bars, event halls and permanent exhibit halls. Parque das Nações is located right next to the Tagus River (Rio Tejo) on the East of Lisbon.