Beneath Cappadocia lies Derinkuyu, a vast underground city hiding ancient secrets. Who built it, why, and when? Explore history, mystery, and theories behind one of Earth’s most astonishing hidden worlds.




Learn more about your ad choices. Visit megaphone.fm/adchoices

The Best Evidence for Aliens Existing

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!