The exact date of Kazan foundation is unknown. According to the opinions of some historians it was founded in the second half of the 13th century, It is located on the banks of the Volga River. Kazan is a large industrial center of the region. It witnessed many important historical events. For example, here the leader of the Bolsheviks party Vladimir Lenin started his activities. Kazan is a very interesting city from the architectural point of view. Here one can see old buildings, which have been carefully preserved till nowadays: the Kremlin with various constructions of the 16th-18th centuries, the Peter and Paul cathedral, the Marjani mosque.