Ancient Structures Are Made of Stone, You Know?

The reason so many ancient structures are made of stone is because they're the ones that are still around today. Even things made of bones, which are organic matter, even those can be eaten by the hungry planet upon which we live. So when you see things like the pyramids, a giza or Stonehenge or any number of ancient structures, you have to remember, you're seeing a very small percentage of what was a thriving world.