A new 3D reconstruction of a barrier in the sistem claustra Alpium Iuliarum can be seen on the YouTube Channel of the project Claustra+.

The Gradišče near Rob barrier is placed on the far northeastern edge of the Bloke Plateau, 6 km east of the Novi Pot barrier. The barrier wall in Gradišče stands out due to its ground plan. The line of barriers from Rijeka in Croatia all the way to this spot goes in the direction of the northeast and in the middle of this barrier section, at the top of the Gradišče Peak (Gradiški vrh), the wall breaks down for 90 degrees and descends the slope to the west. It was once fortified with seven towers of square shape. From the Gradišče near Rob barrier, it was possible to control the entire valley due to the exceptional view from the Gradišče Peak.