Pictograph Cave State Park

This is Ghost Cave, one of three main caves at Pictograph Cave State Park in Montana. Artifacts have been found dating back five thousand years, and ancient paintings covered the cave walls. Sadly, vandalism and erosion have ruined most of the interesting stuff here. The rock formations themselves, and the stories of tens of thousands of years of human activity, however, were cool enough. Reading Richard Dawkins really gives me an appreciation for the huge time-scales over which life on our planet has developed. His books are about what is probably the most interesting and significant stuff in the whole world, or possibly the whole universe, so you might want to check them out.