People have been building structures of various forms and purposes for tens of thousands of years. But some of them seem to be covered in a veil of mystery that puzzles scientists all over the world. Some of these structures question everything we think we know about history, and others just simply defy any logical explanation. From the ruins at Gobekli Tepe that should not exist to churches that were almost burned to the ground by teenagers, these are 15 amazing structures shrouded in mystery.