The Pinnacles, WA

These limestone formations in Western Australia were created by the erosion of sand dunes made from marine fossil-bearing sediments.  

Plants once lived on the dunes and contributed to calcite cementation of interior columns, which have been exposed by erosion of softer dune material.

It reminds me of the film Pitch Black a little bit, except, without the alien human eating creatures :/

http://www.youtube.com/watch?v=7SVUrY2JXBg&feature=fvwrel