The Teutonic castle from the 14th century is the oldest monument in Węgorzewo. It owes its present appearance to the reconstruction carried out in the 1980s. It was supposed to house a library, the seat of the City Council and the Registry Office. However, in 2000, the castle was sold to a private investor. The building is currently inaccessible to tourists.
The construction of the stronghold began in 1398 by order of the commander Werner von Tettingen. The gothic building is located on a river island at the mouth of Węgorapa from Lake Mamry. In 1656, the stronghold was destroyed by the Tatar army. After the reconstruction in the baroque style, the castle lost its military significance. In the 17th century, he was visited by the Polish king Stanisław Leszczyński and the Prussian ruler Frederick the Great.
During the Napoleonic campaign, it housed a hospital for wounded soldiers. Later, the castle was taken over by the Polish army of generals Jan Henryk Dąbrowski and Józef Zajączek. In 1945, the building was completely burned down by the Red Army.