If WA does not quench your thirst of harsh wilderness, it is unlikely that anywhere else in the world will. That said, most visitors stay within the very civilised areas of the southwest corner and Broome, which have many attractions and well developed facilities.
Ancient forms of life
Thrombolites at Lake Clifton and stromatolites at Shark Bay are rock-like mounds built by micro-organisms that resemble some of the earliest forms of life on earth.