https://www.thevintagenews.com/2016/10/06/the-belogradchik-fortress-is-one-of-the-best-preserved-strongholds-in-bulgaria/?utm_source=penultimate
The ancient Belogradchik Fortress, also known as "Kaleto", is one of the best-preserved Bulgarian fortresses located in the Balkan Mountains. It is
belogradchik fortressonebestpreservedstrongholds