I do wonder how natural the roof of this 'cave' motel was? Could it be coloured textured concrete? Would have to be quite thick if it was though.

The other place, the "Outback Experience Comfort Inn" (or similar name) was the real true deal no doubt, with room tunnelled into the true rock and cliff. Took photos of that too, sometime in the past. Might be on an external HDD which failed but probably the disk is still intact.