Deep inside is a wide chamber that appears to have been used in ancient rituals. The walls of the roughly circular space are densely covered in cave paintings. At first glance, they seem much like those found in other caves in that part of Europe, rendered in red and brown ochers. Look closely, however, and you will see that the most common figures depicted are subtly non-human. They are humanoid, but slightly hunched, and while it is hard to be sure owing to the primitive style of the art, each figure appears to have two short, conical horns on its head, and a hint of a tail. Others will stay.