Yerevan  is the capital and largest city of Armenia. Situated along the Hrazdan River, Yerevan is the administrative, cultural, and industrial center of the country. Of the notable landmarks of Yerevan, Erebuni Fortress is considered to be the birthplace of the city, the Katoghike Tsiranavor church is the oldest surviving church of Yerevan and Saint Gregory Cathedral is the largest Armenian cathedral in the world, Tsitsernakaberd is the official memorial to the victims of the Armenian Genocide, and several opera houses, theatres, museums, libraries, and other cultural institutions. Yerevan Opera Theatre is the main spectacle hall of the Armenian capital, the National Gallery of Armenia is the largest art museum in the Republic of Armenia and shares a building with the History Museum of Armenia, and the Matenadaran repository contains one of the largest depositories of ancient books and manuscripts in the world. The neoclassical Republic Square is the center of the city and the monumental Cascade steps lead from the city center to Victory Park, home of a Luna Park and the statue Mother Armenia overlooking Yerevan. Aram Street of old Yerevan and the newly-built Northern Avenue are respectively among the notable examples featuring the traditional and modern architectural characteristics of Yerevan.