In 1988 the USSR ratified Convention concerning the protection of the World Cultural and Natural Heritage (Paris, 1972), which provides for the most prestigious international list of heritage, the UNESCO World Heritage List.
“Historic Centre of Saint Petersburg and Related Groups of Monuments” became the first Russian site to be inscribed on the UNESCO list in 1990. This site is unique in its scale not only for Russia but for the entire world. The site consists of 36 components and 86 elements, located on the territory of two constituent regions of the Russian Federation – City of Saint Petersburg and Leningrad Region. The historic centre of Saint Petersburg is the nucleus of this nomination; its area is around 4,000 hectares. The borders of the site cover the territory of over 23,000 hectares.
“Historic Centre of Saint Petersburg and Related Groups of Monuments” on the UNESCO World Heritage Centre website.