Ključ Castle, Medieval fortress in Gacko Municipality, Bosnia and Herzegovina.
The limestone castle complex consists of a quadrangular main tower, defensive structures, ramparts, and walls positioned on a high rocky slope at 521 meters elevation.
The fortress gained regional power in the early 15th century under Grand Duke Sandalj Hranic, who issued several charters from this strategic location.
The architectural ensemble includes the Kljuc fortress, the Podkljuc castle town, and the Kljuc Mosque with a harem, representing different historical periods.
The ruins of the castle remain accessible for archaeological research, with investigations continuing since the late 19th century to uncover construction techniques and historical details.
The last Bosnian king, Stjepan Tomasevic, sought refuge in this fortress from advancing Ottoman forces before its conquest in 1463.
Location: Gacko Municipality
GPS coordinates: 43.09340,18.48890
Latest update: March 7, 2025 12:27
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