WE'VE GOT MAIL
Bulgaria is a relatively unknown part of Europe even for me who comes from Austria. For decades it was cut off by the Iron Curtain and not a destination for visiting. If you are a historian you may think of the Thracian tomb there, a UNESCO World Heritage site since 1979.
If you are interested in arms and weapons the name Arsenal may tell you something - a factory located there, which built a lot of small arms, among it the famous AK 47, the Kalashnikov.