Smolensk Kremlin was built between 1595 and 1602, during the reign of Tsars Fyodor I Ioannovich and Boris Godunov. The length of the walls is about 6.5 kilometres, of which less than the half was preserved. The fortifications were built under supervision of the architect Fyodor Kon. The Smolensk Kremlin is classified as an architectural monument protected at the federal level, and also has a great historical significance, in particular, as the fortress protecting the Russian state from the west over centuries.
Smolensk historically had a great significance for the defence, and this is why Russian rulers paid considerable attention for its fortifications. In the spring of 1554, Tsar Ivan the Terrible ordered to build a new tall wooden fortress. After the development of artillery, it became clear that a wooden fortress is no more suiteble for the defence, and in the end of the 16th century it was decided to build a new stone fortress at the place of the old one.
In December 1595, the preparations for the construction started after the official decree was issued. The construction works were very intense and were performed daily from sunrise to sunset. The construction workers, however, lived in harsh conditions, and revolted in 1599 because of hunger, cold, and diseases. In the summer of 1597 long and heavy rains flooded all the trenches and ditches, and the construction workers had to strengthen the landslide soil by piles. In 1600, because of the heat and heavy rains, a large amount of crops was lost in Russia, causing the famine. The construction of the new fortress used the old existing fortifications, so that in some places the wall was built on top of them, and in certain areas the new fortress was extended beyond the limits set by the old one. The construction started from the western side of the fortress.
Several sections of the wall have survived, the eastern section with nine towers, the south-western section with five towers, and the northern section with three towers. The most famous remaining tower is the round-cornered tower named Veselukha. This name was given to it because of the nice view which opens from the tower. The Main Gate Tower was Frolovskaya (Dnieper Tower), through which was the exit to the capital of the Russian state. The second most important was Molohovskaya tower, opens the way to Kiev, Krasny and Roslavl.
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.