The Fortress of Herzog Stjepan Vukčić Kosača stands on Buturovica hill near Ljubuški at 396 meters elevation, serving as a symbol of medieval Bosnian power and governance. Built largely in the 15th century, the fortress features a central tower called Herceguša constructed in the late 14th or early 15th century, with its distinctive polygonal perimeter wall added during the Ottoman period after 1472. The fortress retained military service until 1835 and has been designated a national monument of Bosnia and Herzegovina since 2003. Currently undergoing UNESCO-supported restoration efforts, the ruins preserve impressive medieval architecture and commanding views of the surrounding Herzegovina region. The site's name heritage connects directly to Herzog (Duke) Stjepan Vukčić Kosača, whose title evolved into the region's name.
