Is an out-of-the-way ruin in South Africa the oldest human structure on the planet? Or did something other than humans build it? These are the rumors surrounding a place sometimes called Adam's Calendar -- but how do the rumors compare to the facts? Join Ben and Matt as they dive into the story of strange historical ruins.They don't want you to read our book.: https://static.macmillan.com/static/fib/stuff-you-should-read/See omnystudio.com/listener for privacy information.