At last count, the world contained about 7.4 billion people. That's quite a lot already, and it's impossible to say exactly how many have lived before us. With so many people in total, it's no wonder that countless stories have been left untold, objects left buried, and mysteries left unsolved. As much as we know about the world, and as many mysteries as we've already solved, there is still so much more we can't fully comprehend - and perhaps never will - about the distant past.

Symbols. Scrolls. Artifacts. Sometimes it's hard to fathom exactly what else could be out there, or even in our own backyards. Some believe there is ancient technology yet to be discovered, or even entire civilizations left to be found. And sometimes, ancient artifacts can change how we view our history. Let's take a look at some of what our ancestors have left behind.

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