Sótano de la ciudad de Vilna

There is a bastion on the top of Bakszt - a fortification structure, reinforced with a wall and a moat, consisting mainly of a low, horseshoe-shaped tower. Over the centuries, the walls have been destroyed and filled in, but they were renovated and since 1989 there is a museum inside the fortification, where you can hear about the history of this place and its value for Lithuanian culture.