This old park commemorates the 15th century battle against the Turks. Also serves as a museum - various war-related memorabilia on display.
Wikipedia https://bg.wikipedia.org/wiki/Парк-музей_„Владислав_Варненчик“
Address bulevard Yanush Huniyadi 50, Varna, Bulgaria
Coordinates 43°13'49.321" N 27°52'6.325" E