Baba Vida is a medieval fortress in Vidin in northwestern Bulgaria and the town's primary landmark. It consists of two concentric curtain walls and about nine towers of which three are preserved to their full medieval height, including the original battlements, and is said to be the only entirely preserved medieval castle in the country. Baba Vida is 39 metres above sea level.
The construction of the fortress began in the 10th century at the place of the Ancient Roman castell Bononia. The building of Baba Vida is tied to a legend, according to which a Danubian Bulgarian king who ruled at Vidin had three daughters: Vida, Kula and Gamza. Prior to his death, he divided his realm among the three.
Wikipedia https://en.wikipedia.org/wiki/Baba_Vida
Coordinates 43°59'34.719" N 22°53'10.917" E