This museum on the site of a former Soviet nuclear missile base is situated deep in the heart of the Žemaitija National Park. There’s a small exhibition on the history of the Cold War, particularly on how it played out in the Baltic countries, and on the construction and role of the base. The highlight, however, is the chance to poke around inside one of the former missile bunkers.
Built in the 1960s in secret from the Lithuanian people, the base had enough firepower to flatten most of Europe, and may have played a role in the Cuban missile crisis. It's about 8km from Plateliai: follow the main road to Plokštinė, then 5km along a sign-posted gravel road through the pines.