Bolgar State Historical and Architectural Reserve is the world's northernmost
medieval monument of Muslim architecture, the unique and the only model of the Bolgar-Tatar architecture of the mid XIII-XIV centuries. It has no analogues in the world as a valuable historical monument, testifying about the missing states (Volga Bolgar, the Golden Horde), a vanished culture, way of life and how it made a significant impact during the X-XV centuries on the development of culture and architecture.