Although the Kremlin (citadel) of Nizhny Novgorod is less known outside of Russia than its namesake in Moscow, it arguably is a lot more scenic, thanks to its location. It sits on a steep hill above the Volga River, with great views to the north and east.
Replacing an old medieval citadel, the red-brick Nizhny Novgorod Kremlin we know today was built in the early 16th century, the construction being supervised by the Italian architect Pietro Francesco. It survived several sieges during the wars with the Khans of Kazan later the same century.
After a period of decay, the Kremlin was restored in the 20th century, and is now the city's most prominent landmark.