Whatis the mystery of Kailash?

Whatis the mystery of Kailash? The south face of Kailash Parvat has a scar as if something rolled down from it. When Ravana tried to take Shiva to Lanka, he first tried to lift it and tried to take the whole mountain. But Shiva effortlessly crushed him down with his toe. Then, Ravana climbed Kailash to take Mahadev. When he reached the peak, Mahadev kicked him down from his drum and Ravana fell down the mountain leaving this scar which we see today. There is also a lake near Kailash named Rakshastaal. It is said that Ravana sacrificed his 9 heads here and the lake was made from his blood.