6. Under Water City
Japan’s Underwater Pyramids are the BIGGEST unsolved mystery to date. Till now eight sites have been discovered but certain features still hard to dismiss this as any natural episode. This semi-circular structure gives a glance of some bench in park. A huge head that appears to have hair and numerous strange round holes in rock and some of them gives you feelings like they were made to support large wood made pole. It might be possible that few thousand years back during the last ice-age when sea may have been caught up in the ice caps these structures were probably not covered by the ocean.