I haven't figured out WHY this exists but it does. There's a full-scale styrofoam replica of Stonehenge located in Virginia called, appropriately enough, Foamhenge. You can find a Foamhenge web site at https://coxfarms.com/about/foamhenge/ although a more detailed description can be found on Wikipedia at: https://en.wikipedia.org/wiki/Foamhenge