The elongated Lake Gopło in central Poland’s region of Kujawy is one of the country’s biggest bodies of water. With a surface area of approximately 21 square kilometres, it’s considered the tenth (or ninth, according to other estimates) largest lake in Poland. It’s surrounded by meadows, forests and fields and the river Noteć passes through it. On Gopło’s northern shore lies the town of Kruszwica, where you can find Mysia Wieża (Mouse Tower), an architectural monument dating back to the 14th century. The octagonal tower is a remnant of a once-existing castle and is 32 metres tall. Source: culture.pl