This Atlantis-like ancient city, located in the Ryukyu Islands of Japan, is a mysterious underwater pyramid structure nestled in the depths of the ocean. While this underwater city was once thought to be a natural creation, further research found that it’s actually the remnants of a long-forgotten civilization. The crazy part is, it was only discovered in 1995, meaning it was unknown to the world before this time. So, how did this place just disappear without a question? Since its discovery, it has attracted a ton of fascination by divers who are eager to explore the remains of this secretive world.