MonoMonday: Stone

We took the twins to Hassan's Walls today. They were more interested in the cave than the view. Here they are sitting on top of it. I suppose it is more accurately described as rock than stone, but hopefully near enough for JacZero's challenge.
It was quite a successful afternoon out. We saw two camels in a paddock which used to house a couple of emus but no sign of them today.
Last stop was to the gun emplacements at Lithgow. They were put there during WW2 in case the Japanese decided to attack the nearby small arms factory. The extra shows Ayman climbing on one of them.
Even more exciting were the concrete bunkers and tunnels which lent themselves to several rounds of hide and seek.