Man has always had a deep seated desire to explore, but the sheer size of our planet means that not everything can be seen. And the places that have been seen; haven’t always been documented. There are regions of our planet so hostile, so cut-off, or just so damn big that even Google Maps cars won’t go there. For example, would you like to know what these strange structures are? Which have lain in the middle of the Siberian wastelands for nearly two centuries? Do you want to find out what a Turkish man stumbled upon when he was just fixing up his home? And would you like to explore the unspeakable horrors that lay beneath one of the world’s most famous capital cities? If the answer is yes, yes, and definitely not, then tough tamales my little mystery maniacs, because now you’re going to join me as we explore the five most mysterious secret structures on Earth.