Trafalgar Square death, and the square did not open until 1844. The Nelson's Column at its centre is guarded by four lion statues. A number of commemorative statues and sculptures occupy the square, but the Fourth Plinth, left empty since 1840, has been host to contemporary art since 1999. The square has been used for community gatherings and political demonstrations, including Bloody Sunday in 1887, the culmination of the first Aldermaston March, anti-war protests, and campaigns against climate change. A Christmas tree has been donated to the square by Norway since 1947 and is erected for twelve days before and after Christmas
Aristotelous Square Following Greek traditions, apart from a Christmas tree, the municipality of Thessaloniki also decorates a giant "Christmas ship", which is a Greek variant of the custom of decorating a Christmas tree. Both the Christmas tree and the Christmas boat are over 20 meters tall and are considered a tourist attraction for visitors to the city at the time they are up. Since its creation, the square has been used for a number of important party rallies. Many former Prime Ministers of Greece have given their main address from Aristotelous Square, including Andreas Papandreou, Costas Karamanlis and George Papandreou. Apart from