Africa's Stonehenge.

Is Adam’s Calendar the oldest manmade structure on Earth—or a pile of stones hyped up by ancient alien fans? We dig into South Africa’s strangest mystery to find out what’s real. Learn more about your ad choices. Visit megaphone.fm/adchoices

Om Podcasten

Decoding The Unknown explores history's deepest mysteries to see if we can draw any conclusions about what actually happened. Russian hikers killed by a yeti? Aircraft lost to sea monsters? Probably not, so let's try and figure out what really happened. New episodes every Friday. Also on YouTube!