old cannons in kyiv fortress, a complex of russian fortifications in ukrainian capital built over the span of 17-19th centuries

old cannons kyiv fortress complex russian fortifications ukrainian capital built span 1719th centuries prison ukraine travel touristic places pechersk outdoor military medieval history historical historic gun fortification landmark cannon architecture kiev artillery barracks ancient castle city destination europe caponier hospital interesting fortified kosyi tower semicircle redoubt skew viewing semicircular kyivska fortetsia wooden embrasures caponir brick wall entrance wheeled