What is the oldest human-created artifact that has mattered to you? Why/how does it matter?

The object in history that matters to me the most is Stonehenge. This is important to me because when you study mysteries like this you can find a whole new kind of outlook on history and the world at the time. I don't know very much about it but the facts are very blurry and I see that as an opportunity for researchers and historians to look beyond the facts in front of us and dig deeper to find greater meaning in things we may have overlooked. I find Stonehenge an amazing artifact in history that people should pay more attention to because I think that there is so much more to learn from it, and that is why is matters to me.