Burg am Grazer Schloßberg, Medieval castle on Schlossberg hill, Graz, Austria

Burg am Grazer Schloßberg is a fortification on a hilltop in Graz that now consists of the remains of a medieval castle, with the Clock Tower and Bell Tower as its most prominent structures. The site spans a large area with various sections that once housed different functions including storage facilities and military installations.

The castle on the Schloßberg dates to the 12th century, when a bergfried was built at the hill's highest point and the city walls were joined to it. In 1480 it withstood a Turkish attack, and in 1532 Süleyman I's army passed by without assaulting it. In 1809 Franz Xaver Hackher zu Hart defended the hill; the French took it only through the peace after Wagram and demolished it at the turn of 1809/10, sparing the Clock and Bell Towers, which Graz residents bought back.

The name Schloßberg means "castle hill", and the hilltop became a public park in 1839 after the French demolition. The Kasemattenbühne stage occupies a cellar of the Stallbastei, the one bastion of Domenico dell'Allio's 1543 rebuilding that survives. The 94-metre Türkenbrunnen, dug by hand between 1554 and 1558, can still be entered.

The fortress stood on the highest point of the Schloßberg, where the keep was probably the first building; the site was reached by roads still in use, over which wagons and pack animals carried building material, reportedly including elephants and camels taken as war booty. The 94-metre Türkenbrunnen was dug at the Stallbastei between 2 April 1554 and 11 January 1558.

The 94-metre Türkenbrunnen well was dug between 1554 and 1558 next to the Stallbastei, the only bastion of the dell'Allio modernisation still standing. Material for the 1543 rebuild was hauled up by carts and pack animals, among them elephants and camels said to come from captured war booty.