Tustan was a Medieval cliff-side fortress-city and customs site of the 9th—16th centuries, an Old Rus cliff-side defensive complex. rock complex of Tustan is a popular tourist destination. Fortress of Tustan, Tustan fortress, rock complex of Tustan, sandstone rocks, magical view of the rock complex, fortress-city, Medieval cliff-side fortress-city, rocks in the mountains, rocks in the Carpathians, tourist magnet,