Stonehenge... Give or Take Traditional Cache

This location might as well be the same thing for a caveman, it would make no sense. Who put these here? What tools did they use to make them so perfect? What purpose do these monoliths serve? How can we harness the power of these giant metal stones? It is all way over my head, but why not put a geocache here and let the smarter guys figure it out for me. 

I know it sounds a little cliché, but this is a tricky little hide. I have seen countless numbers of caches like this and wanted to finally make one too and thought this is as good a spot as any. Have fun with it, hopefully it earns the rating. For the sake of the next finder please return it the way you found it or better. Happy caching!