Interesting museum dedicated to national naval history - with major emphasis on its military side. Small but insightful.
Wikipedia https://ru.wikipedia.org/wiki/Военно-морской_музей_(Варна)
Phone +359 52 63 30 15
Address bulevard Primorski 2, Varna, Bulgaria
Coordinates 43°12'1.707" N 27°55'17.752" E