Nizhny Novgorod Kremlin is a historical centre of Nizhny Novgorod, the city heart, and the place that the history of Nizhny Novgorod was started. Nowadays Nizhny Novgorod Kremlin is said as the grandest and the most majestic medieval fortress extant in the central Russia. http://www.nizhnynovgorod.com/tourism/sightseeing/city_sights/nizhny_novgorod_kremlin/