From on top of The Three Sisters. 

From one source: 

"According to Aboriginal legend, each pillar of rock represents one of three sisters from the Katoomba tribe.  There are at least two stories describing the circumstances of the sisters' entombment in stone. Both involve their father who uses magic to protect them and turns them into stone. Through tragic circumstances he is unable to return and release them. One version tells how their father Tyawan transforms himself into a Lyrebird to escape capture but drops his magic bone in his terror. He is unable to do his magic without it and to this day searches the forest floor while his daughters look on from above the Jamison Valley."