Shanghai's subway operator launched a series of exhibitions at downtown stations on Tuesday, along with newly released memorial tickets and free maps, to mark the 100th anniversary of the founding of the Communist Party of China. At People's Square station a number of "Centennial" trains were introduced on Metro lines 1, 2 and 4, which run beneath landmark Party sites. The exhibitions are being held at Metro stations near 25 Party sites, such as the newly opened Memorial of the First National Congress of the CPC and the former residences of Chairman Mao Zedong and Sun Yat-sen.