Wisłoujście Fortress (Polish: Wisłoujście) is a unique historical fortification located on the northeastern outskirts of Gdańsk, at the mouth of the Vistula River where it meets the Baltic Sea. It is one of the most interesting and well-preserved examples of maritime fortification in Poland, standing out for its unusual circular tower and complex system of bastions.

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Throughout the centuries, Wisłoujście Fortress played a key role in Gdańsk's defensive system. Its main task was to protect the entrance to the busy port and the mouth of the Vistula from enemy attacks from the sea, making it a strategically vital site for the city and the entire region. This place holds many stories and stands as a testament to former maritime power.
Today, Wisłoujście Fortress is a popular tourist attraction and an integral part of the Museum of Gdańsk. Visitors can explore its impressive fortifications, stroll along the ancient ramparts, learn more about the rich history of the site, and enjoy views of the surrounding area. It offers a fascinating dive into the past and provides a better understanding of Gdańsk's maritime heritage.