We had known about HR from the movie. The rocks are the result of volcanic lava that has formed a plug. Over the years the soil has been eroded and the plug rises above the landscape. The altitude is about 800m. We could feel our eats pop, and my waterbottle had compressed as we drove home.
WARNING - LOTS OF ROCKS AHEAD; SCROLL DOWN FOR SELFIE etc
Walking up to the top of the pinnacles
At the top.