It is the Castle of the Teutonic Order in the village Ushakovo, which was called Brandenburg up to 1946. It is believed that the year of the foundation of the castle is 1266. Throughout the history of the Teutonic Order Brandenburg Castle was one of the most important church-related castles. The castle can be seen as the final stage in the development of the architectural style of ‘fortified castle’. In contrast to his later counterparts, this castle has quite a large courtyard. The gates were located at the centre of the western wing, opposite the vorburg, where the household facilities were located. In all four wings there were cellars. The ground floors of the castle were used for household needs. In the north—east wing there was a kitchen, and next to it there was a limestone well. Since 1322 it secretly kept one relic: a fragment of the Holy Cross on which Jesus was crucified. Brandenburg provincial commander Gunther von Hohenstein (Günther von Hohenstein, 1370-1380) distinguished himself as a diplomat, taking active role in the negotiations with Lithuania. The Emperor Charles IV in 1379 presented him with a relic of St. Catherine, which is now exhibited in the chapel of the castle. In 1525 the Grand Master of the Teutonic Order Albrecht of Brandenburg (1490—1568) transformed the Teutonic Order in the Duchy of Prussia.

In the XVI—XVII centuries Brandenburg turned into a rather large settlement with its own fishermen, gardeners, boaters, cab drivers and serfs. The favourable location on a busy road, at the bay and near the river contributed to the development of the settlement. In addition, this was a place of trade fairs. In 1652 Brandenburg was called ‘free borough’. King Frederick William I intended to give it the status of a city, but it did not happen. In 1945, Brandenburg was in the area of heavy fighting, and was partially destroyed.