The world has existed for millions of years. There are many civilizations that lived before us that are yet to be discovered. Some cities of the ancient times that are buried deep in the sea or in the ground yet to be identified by man. In China Shi Cheng an underwater city was only flooded in 1959 during a dam construction. There is a entire city now 85 to 130 feet deep underwater about that is about the size of 62 football fields. These places have become a massive tourist attraction in China.