The natural phenomenon Rittlite is located in the Iskar Gorge, north of the village of Lutybrod. They are limestone rock formations, more than a hundred and twenty million years old. It is supposed that the rocks have been delayed until the region here has been a seabed. Later, in the folding of the Alps-Himalayan mountain range, the "Rittlite" formed in their present form.
The formations are on the riverside of the Iskar River and are like tall, narrow, parallel to each other walls, resembling the rattles of a cart, which is why the local population called them "Rittlite". The most impressive are four parallel vertical walls on the left riverside, while those on the right are significantly smaller and less pointed.