Vilnius
Vilniaus gynybinės sienos bastėja
Bastion of the Vilnius Defensive Wall
Free on the last Sunday of the month
A 17th-century fortification and LNM branch in the Old Town; history of the city's defensive wall and historic weaponry, with an underground artillery tower.
Bokšto g. 20/18, Vilnius
lnm.lt/en/museums/bastion-of-the-vilnius-defence-wall/