On the south bank of the river Pregel in Kaliningrad, located Fridrihsburgskoy Gates fortress, built in 1852 by the court architect William IV - August Shtyulerom. The gate is the only surviving part of the citadel Friedrichsburg.

Fridrihsburgskaya fortress built in 1657, designed by PH Otter to protect Konigsberg from the river, it had the shape of a square and angular bastions with euphonious names: Ruby, Pearl, Diamond and Emerald. In the courtyard of the fortress housed barracks, a church, commandant, barns, prison and tseyghaus. Friedrichsburg remarkable visit in 1697, the Russian Tsar Peter the Great under the name sergeant Peter Mikhailovich for development of artillery science. On his return to Moscow on the orders of Peter was built several forts (Aleksender-trench, the Citadel and Kroshlot) on the island of Kotlin, which served as a model of the fortress Friedrichsburg.

In the mid-nineteenth century with the construction of new fortifications around the rotary shaft of Konigsberg (now Kaliningrad), Friedrichsburg was upgraded in the eponymous fort .  In this period it was built brick gate extant .  In 1910, the fort was declared obsolete and sold to municipal authorities .  During the construction of the Imperial Railway main part of the former fortress was demolished, ditches filled up, trees razed, and the territory of the fort were laid railroad tracks .  From the structure of the barracks were only the walls of the south-eastern bastion and gate .  During the assault of Konigsberg (April 1945 . ) Was lost last Tower, the southern wall of the guardhouse and badly damaged the gate .  In 1960 the ruins were found Fridrihsburgskih gate architectural monument, and since 2002 are the subject of Cultural Heritage (federal) .  In March 2007, a unique historical object has been handed over to the Museum of the World Ocean . 

Nowadays restored fortress Fridrihsburgskoy Gate is a massive brick building with a coat of arms on the facade, towers, gates and cobbled iron antique courtyard. On the territory of the historic building it is located: a restoration laboratory, a museum shipyard and "Lodeynoe yard", and at the gate, there are three old guns. In the very gates of the Museum of Russian naval glory, the exhibition which tells the story of the park vessels includes unique exhibits and a replica of the stern of the battleship "Poltava" - the pride of Peter's fleet. At the gates of the fortress Fridrihsburgskoy window is a bronze Kёnigsbersky cat, which is a prototype of the philosopher-Hoffman cat Murr.