Ključ Castle
Gacko Municipality, Bosnia and Herzegovina
Ključ fortrass, locally known as Stari grad Ključ (transl. Old Town Ključ), is a medieval castle complex in the village of Ključ, Gacko, Bosnia and Herzegovina. The historic area includes the Ključ fortress, the Podključ castle town (in Serbo-Croatian: podgrađe, lit. transl. below-town or under-town) as part of a wider area just beneath of the fortress, the Ključ Mosque (Ajnebeg-dede Mosque, Ključ Captains' Mosque or Starica) with a harem. The site has been declared a National monument of Bosnia and Herzegovina by the Commission to preserve national monuments of Bosnia and Herzegovina.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).