the early 19th century. In 1814, a neoclassical portico decorated with the British coat of arms was added to the Main Guard building so as to serve as a symbol of British Malta. Other 19th-century neoclassical buildings include the Monument to Sir Alexander Ball (1810), RNH Bighi (1832), St Paul's Pro-Cathedral (1844), the Rotunda of Mosta (1860) and the now-destroyed Royal Opera House (1866). Neoclassicism gave way to other architectural styles by the late 19th century. Few buildings were built in the neoclassical style during the 20th century, such as the Domvs Romana museum (1922), and the Courts of Justice building in Valletta (1965–1971). Mexico As part of the Spanish Enlightenment's cultural impact on the kingdom of New Spain (Mexico), the crown established the Academy of San Carlos in 1785 to train painters, sculptors, and architects in New Spain, under the direction of the peninsular Gerónimo Antonio Gil. The academy emphasized neoclassicism, which drew on the inspiration of the clean lines of Greek and Roman architecture, but also, for some monuments, from the Aztec and Mayan architectural traditions. Neoclassicism in Mexican architecture was directly linked to crown policies that sought to rein in the exuberance of the Mexican Baroque, and to create public buildings of "good taste" funded by the crown, such as the Palacio de Minería in Mexico City, the Hospicio Cabañas in Guadalajara, and the Alhóndiga de Granaditas in Guanajuato, all built in the late colonial era. Polish–Lithuanian Commonwealth The centre of Polish Neoclassicism was Warsaw under the rule of the last Polish king, Stanislaus Augustus. The University of Vilnius was another important centre of the Neoclassical architecture in Europe, led by the notable professors of architecture Marcin Knackfus, Laurynas Gucevicius and Karol Podczaszyński. The style was expressed in the shape of main public buildings, such as the University's Observatory, Vilnius Cathedral and the town hall. The best-known architects and artists, who worked in Polish–Lithuanian Commonwealth were Dominik Merlini, Jan Chrystian Kamsetzer, Szymon Bogumił Zug, Jakub Kubicki, Antonio Corazzi, Efraim Szreger, Chrystian Piotr Aigner and Bertel Thorvaldsen. Russia In the Russian Empire at the end of the 19th century, neoclassical architecture was equal to Saint Petersburg architecture because this style was specific for a huge number of buildings in the city. Catherine the Great adopted the style during her reign by allowing the architect Jean-Baptiste Vallin de la Mothe to build the Old Hermitage and the Academy of