A long, long time ago, before the arrival of the elves and humans, there lived in what was then known as Catzalvania, a race of cats. This was one of their nine ancient and holy places where, it was said, the "nine lives' of the cat race were kept. Originally there was an entry to the cave system -- the lower parts of the entrance to the caves in the cliff on the left looking like a bowed leg, and on the right one half of the other leg. These two "legs" orignialy formed an arch over the sacred cave entrance until, during a particularly difficult geological period an earthquake caused the vertical split of the whole entrance (and probably dropped the stone in front of the right leg), leaving cat monument with a gaping dark vertical cleft in it. All of this was far and away long, long before the current races arrived, and some say the evidence is too slim to make any conjecture about the artifact. In fact, some people even say those who try to explain such artifacts are just making it up as they go along. Some would say that.
Where the cat race went and whether they will ever return is a mystery but there are legends that say they will return some day.
AJ