of Portugal (Museu Etnológico Português) was installed. Further remodelling of the monastery was begun in 1898 subsequent to the work done by Parente da Silva in 1895 on the central annex, now simplified, as well as restoration of the (the chairs used by the clergy in religious services), which were completed in 1924 by sculptor Costa Mota. In 1938 the organ in the high choir was dismantled at the same time that a series of stained-glass windows, designed by Abel Manta and executed by Ricardo Leone, were replaced in the southern façade. As part of the celebrations marking the centenary of modern Portugal in 1939, yet more remodelling was completed in the monastery and tower. During these projects, the baldachin and tomb of Alexandre Herculano were dismantled and the cloister patio was paved. In 1940 the space in front of the monastery was redesigned for the Portuguese Exposition. The Casa Pia vacated the interior spaces of the cloister and the tombs of Camões and Vasco da Gama were transferred to the lower choir. A series of windows designed by Rebocho and executed by Alves Mendes were completed in 1950. In 1951 the remains of president Óscar Carmona were entombed in the Sala do Capítulo. They would later be transported to the National Pantheon in 1966 to join the bodies of other former presidents and literary heroes of the country. The Maritime Museum (Museu da Marinha) was inaugurated in the western wing of the monastery in 1963. Republic The church and the monastery, like the nearby Torre de Belém and Padrão dos Descobrimentos, symbolise the Portuguese Age of Discovery and are among the main tourist attractions of Lisbon. In 1983, UNESCO formally designated the Monastery of the Hieronymites and Tower of Belém as a World Heritage Site. When Portugal joined the European Economic Community, the formal ceremonies were held in the cloister of the monument (1985). Two major exhibitions took place at the monastery during the 1990s: 4 séculos de pintura (), in 1992; and the exposition "Leonardo da Vinci – um homem à escala do mundo, um Mundo à escala do homem" (), in 1998 (which included the Leicester Codex, on temporary loan from Bill Gates). At the end of the 20th century, remodelling continued with conservation, cleaning and restoration, including the main chapel in 1999 and the cloister in 1998–2002. On 13 December 2007, the Treaty of Lisbon was