Wisłoujście Fortress is the oldest coastal fortress located in Gdańsk, on the banks of the Martwa Wisła River, at the mouth of the old Vistula River, which flows into the Gulf of Gdańsk. This impressive defensive structure protected ships en route to the port of Gdańsk. It also served as a lighthouse, a mooring place for the Polish fleet, and a prison.

Moszna Castle is a historic castle located in the village of Moszna, in southwestern Poland. Moszna Castle has become a popular tourist attraction, drawing visitors not only for its historical and architectural significance but also for its enchanting and fairy-tale-like appearance.

Poland, officially the Republic of Poland, is a country in Central Europe. It is divided into 16 administrative provinces called voivodeships, covering an area of 312,696 km2 (120,733 sq mi). Poland has a population of over 38 million. Warsaw is the nation's capital and largest metropolis. Other major cities include Kraków, Łódź, Wrocław, Poznań, Gdańsk, and Szczecin.

Malbork Castle, also known as the Castle of the Teutonic Order in Malbork, is a medieval fortress located in the town of Malbork in northern Poland. It is one of the most significant and well-preserved castles in Europe, recognized as a UNESCO World Heritage Site.

Wawel Royal Castle is a castle residency located in central Kraków, Poland. Built at the behest of King Casimir III the Great, it consists of a number of structures situated around the Italian-styled main courtyard. The castle, being one of the largest in Poland, represents nearly all European architectural styles of medieval, renaissance and baroque periods.