The interior of the Palace, only finished in 1910, was magnificently decorated by several artists. The central courtyard (Nations' Courtyard - Pátio das Nações) is covered by a large metallic, octagonal dome with glass panels, designed by Tomás Soler and built after 1880. The lower part of the dome is decorated with the painted coats-of-arms of Portugal and the countries with which Portugal had commercial relations in the 19th century. To the back of the courtyard, a sumptuous stairway, built in 1868 by Gonçalves e Sousa, leads to the upper storeys and is adorned with busts by celebrated sculptors António Soares dos Reis and António Teixeira Lopes. The ceiling frescoes were painted by António Ramalho.