The tower is the only remaining structure of a castle destroyed by Swedish forces in 1657 during the Deluge.
The octagonal shape of the tower is characteristic of Polish defensive architecture from the reign of Casimir the Great.
Archaeologists have found evidence of an early Piast defensive stronghold (grod) on the site predating the brick castle.
The legend of King Popiel is often cited as a cautionary tale against tyranny, dating back to 12th-century chronicles by Gallus Anonymus.
The tower contains 109 stairs leading to the viewing platform at the top.
Lake Gopło, visible from the top, is part of a nature reserve protected for its bird populations.
Mysia Wieża, or the Mouse Tower, is an octagonal brick tower located in Kruszwica, serving as the sole remnant of a 14th-century Gothic castle built by King Casimir the Great. The structure stands 32 meters high and was originally part of a defensive fortress complex protecting the Piast route. It is famously associated with the Polish legend of King Popiel, who was allegedly eaten by mice within the tower. The site offers panoramic views of Lake Gopło, the largest lake in the Kuyavian-Pomeranian Voivodeship. The tower is constructed from red brick and retains its medieval character, having been preserved as a historical landmark. It acts as a central point for visitors exploring the historic Szlak Piastowski route. The site is situated on a peninsula extending into the lake, providing direct access to the water's edge. Archaeological excavations near the base have uncovered traces of earlier fortifications dating back to the early Middle Ages.
The viewing platform at the very top of the tower, looking out over the water and the ruins below.
Climb the stairs during a clear day to see the entirety of Lake Gopło and the surrounding plains.
Combine your visit with a boat trip on Lake Gopło, which departs from the nearby harbor area.
Wear comfortable, flat shoes as the historical internal stairs are steep and narrow.
Do not attempt to climb the tower if you have mobility issues or a fear of heights, as the staircase is quite narrow.
The site is typically closed during the winter season; check local updates for exact seasonal opening dates in spring.
Maintain silence inside the tower to respect the acoustic environment and other visitors.
