The Moscow Kremlin from the point of view of military-engineering art represented outstanding defensive works of XV century. Each tower – an independent fortress. The walls rising on hills and сбегающие from them, have height from 5 up to 19 meters and thickness from 3 up to meters.In the center of the Kremlin – the ancient Cathedral area and the monuments of Russian architecture located around of it which represent one of the most outstanding architectural ensembles of the world.