Astrakhan Kremlin, Russia

The Astrakhan Kremlin is an interesting complex in Astrakhan, Russia, which claims to be included in the UNESCO World Heritage List. 
The wooden fortress was built in 1558 and the steep peak of Hare above the Volga River was chosen as its place. By decision of Ivan IV, the Astrakhan Kremlin was replaced by a stone building, which was taken care of by military engineers from Moscow. The fortification has a triangular shape with eight towers along the walls. One of the towers was known as "Torture" and housed a prison.
Later, two churches were added to the Astrakhan Kremlin - the Holy Trinity and the Assumption in 1700 and 1701, respectively. From the end of the 16th century, the Astrakhan Kremlin became Russia's gateway to Asia. and in an important example of Russian military engineering and construction.