A complex of artillery forts and batteries formed in the XVIII – XX centuries. It is located on 17 artificial islands in the Neva Bay. There are nine objects in the northern part of the water area, seven of them are numbered northern marine batteries and two forts Obruchev and Totleben are the largest in the fortress. Alone at the eastern end of the island is the powder warehouse of the Maritime Department, reminiscent of its appearance in a large Russian stove. But the most impressive buildings of Kronstadt are located south of the island. It was here that in 1703 Peter I founded the first Russian fort in the Baltic – Kronslot. In addition to the Petrovsky “first-born”, there are five forts and two marine batteries on the Grand Raid. The most impressive of them is Fort Alexander I (the Plague), or as the Russian Boyard is also called. No less interesting is the fort “Grand Duke Constantine”, which was a kind of experimental site in the 19th and early 20th centuries, where the latest engineering technologies were put into practice and artillerymen of the fortress received practical training. On the opposite side, closer to the southern shore of the bay, the ruins of the once largest naval fortification of Kronstadt – Fort “Paul I” rise from the water. In 1923, a mine depot exploded on its territory, and then, during XX, explosives were disposed of on its ruins. A little further from the “poor Paul” is his successor – Fort “Count Milyutin” – the creation of the outstanding fortification engineer Eduard Totleben. This is the first armored turret battery in Russia, an unsinkable battleship made of stone and concrete in the 70s of the XIX century. And on the very southern shore of the bay you can see the southern marine batteries No. 1 and No. 2 – small islands in size. A comfortable inspection of these objects is possible during the summer navigation from the ship or boat.