Old town of Visoki, Medieval castle ruins in Visoko, Bosnia and Herzegovina.

Visoki is a medieval castle ruin located on Visočica hill, standing 213 meters above ground with two lookout towers at its southwestern entrance. The fortification covers ground measuring roughly 60 by 25 meters with walls that reach 2 meters in thickness.

This fortress town emerged in the 14th century and served as a key administrative center for issuing royal documents. It maintained this role until its final charter was issued in 1436, marking the end of its active period as a stronghold.

The castle's main official was the castellan, a noble titled Grand Duke of Bosnia; Priboje Masnović, Batić Mirković and Tvrtko Borovinić held the post. In January 1398 Count Priboje Masnović, castellan of Visoki, was accepted as a citizen of Ragusa (Dubrovnik). The name Visoki passed to the town in the valley below, today's Visoko.

The approach is on the southwest side, where a flat area lies about 60 metres below the walls. The site sits at 766.5 m on Visočica, roughly 300 m above the Visoko valley, so the climb is steady. Wear sturdy shoes for the rough, stone-strewn ground.

During the 1992-1995 war, earthworks inside the walls, about 1.15 m below the present surface, brought up fragments of a Gothic portal: six pieces of a lunette and two door-jamb fragments, one carved with a horseman and part of an inscription in Bosnian Cyrillic. The inscriptions were never read; the finds went to the Visoko regional museum.