The Vilnius Castle Museum was opened in 1960, and in 1968 it became a subdivision of the Lithuanian National Museum.

The exposition of the Vilnius Castle Museum displays reconstruction models of Vilnius castles of the second part of the 14th and the beginning of the 17th centuries, armament, iconographic material of old Vilnius.

An observation deck on the top of the tower is the best place from which to appreciate a magnificent panorama of Vilnius.