Archaeological studies suggest that in the first half of the XIV century there was only the southwestern tower of the Castle, intended for housing and hiding from the enemy.
In plan view the tower was close to a square with a side of 11.3 m. The thickness of its walls reached 3 m.
In 2020, the permanent exhibition “Pages of History ... Since the XIV Century” was opened in the tower, which introduces the history of the Lida Castle, since its creation. On six tiers of the tower there are demonstrated unique authentic single finds discovered during archaeological studies: brick with longitudinal grooves from the fingers, stove tiles, semicircular roofing tiles, chess figure rook, checker, needle, comb - XIV- XV centuries.