Vilnius
Gedimino pilies bokštas
Gediminas' Castle Tower
Free on the last Sunday of the month
The only surviving tower of the Vilnius Upper Castle and a key symbol of Lithuanian statehood; exhibition on the Vilnius castles, with a panoramic observation deck.
Arsenalo g. 5, Vilnius
lnm.lt/en/museums/gediminas-castle-tower/