The Vistula River is the longest river in Poland and the longest river to flow into the Baltic Sea, with a length of 1,047 km (651 miles). Its basin, which spans three countries other than Poland, covers an area of ​​193,960 km2 (74,890 sq mi), of which 168,868 km2 (65,200 sq mi) lies within Poland.

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.

Warsaw is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland, and its population is officially estimated at 1.8 million residents within a greater metropolitan area of 3.1 million residents. The city area measures 517 km2 (200 sq mi) and comprises 18 quarters, while the metropolitan area covers 6,100 km2 (2,355 sq mi).

Książ Castle, located in Wałbrzych, Lower Silesia, Poland, is one of the country's largest castles and a significant historical and cultural monument. The castle has a long and complex history, dating back to the 13th century. Over the centuries, it has undergone numerous expansions and renovations. The castle has served many different roles, acting as a defensive fortress, a royal residence, and a cultural center.

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.

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.