Travnik Castle, Medieval fortress in Travnik, Bosnia and Herzegovina.

Travnik Castle, known locally as Stari Grad, is a medieval fortress on a rocky spur of the Vlašić mountain at the eastern end of Travnik. Its irregular pentagonal layout covers about 11,000 m². The highest point is a bastion built by the Ottomans on the site of a medieval keep, rising 16 m above the lowest point. South of it lie a vaulted stone cistern, a rectangular courtyard 28 m long, a powder magazine, and a small yard with an 11 m octagonal tower. A minaret embedded in the western wall is all that remains of the mosque.

The fortress was built in the late 14th or early 15th century as a royal stronghold under Bosnian kings defending the region. In 1463, Ottoman forces under Sultan Mehmed II captured the site, marking a major turning point in its long history.

The fortress has changed names several times: the medieval Garbun, then Travnik after a royal grazing tax, Kastel under Austro-Hungarian rule, and simply Grad among locals. Since 1953, when museum director Stipa Lozić promoted it for tourism, it has been called Stari grad. A small museum inside covers its history and ethnography.

The site is best reached on foot from the town of Travnik below, with a walk of about 20 minutes to reach the entrance. The paths are uneven and can be slippery after rain, so sturdy shoes and basic fitness are helpful for the climb.

The fortress's name changed repeatedly: Garbun, Travnik, Kastel, and simply Grad. In 1953 Stipe Lozić, director of the Travnik Regional Museum, promoted the name Stari grad to draw tourists. The museum he led still occupies the site today.