medieval church. Saint Sarkis Cathedral rebuilt in 1835–42, is the seat of Araratian Pontifical Diocese of the Armenian Apostolic Church. The Blue Mosque or "Gök Jami", built between 1764 and 1768 at the centre of the city, is currently the only operating mosque in Armenia. The Red Bridge of Hrazdan River is a 17th-century structure, built after the 1679 earthquake and later reconstructed in 1830. Contemporary Yerevan Opera Theater or the Armenian National Academic Opera and Ballet Theatre opened in 1933, is a major landmark in the city along with the Mesrop Mashtots Matenadaran opened in 1959, and Tsitsernakaberd monument of the Armenian genocide opened in 1967. Moscow Cinema, opened in 1937 on the site of Saint Paul and Peter Church of the 5th century, is an important example of the Soviet-era architecture. In 1959, a monument was erected near the Yerevan Railway Station dedicated to the legendary Armenian hero David of Sassoun. The monumental statue of Mother Armenia is a female personification of the Armenian nation, erected in 1967, replacing the huge statue of Joseph Stalin in the Victory park. Komitas Pantheon is a cemetery opened in 1936 where many famous Armenians are buried, while the Yerablur Pantheon, is a military cemetery where over 1,000 Armenian martyrs of the Nagorno-Karabakh conflict are buried since 1990. Many new notable buildings were constructed after the independence of Armenia such as the Yerevan Cascade, and the Saint Gregory Cathedral opened in 2001 to commemorate the 1700th anniversary of Christianity in Armenia. In May 2016, a monumental statue of the prominent Armenian statesman and military leader Garegin Nzhdeh was erected at the centre of Yerevan. Transportation Air Yerevan is served by the Zvartnots International Airport, located west of the city center. It is the primary airport of the country. Inaugurated in 1961 during the Soviet era, Zvartnots airport was renovated for the first time in 1985 and a second time in 2002 in order to adapt to international norms. It went through a major facelift starting in 2004 with the construction of the new Arrival and Departure halls, opened in 2006 and 2007. In October 2011, a new passenger terminal complex was opened, housing state of the art facilities and technology. This made Yerevan Zvartnots International Airport one of the largest, busiest and most modern airports of the Caucasus region. In December 2019, yearly passenger flow at Zvartnots International Airport exceeded 3 million