Mysterious 10,000 Year-Old Underwater Ruins in Japan

Mystical stone structures below the waters off Yonaguni Jima Island, Japan, discovered by a local diver in 1986 There are ruins of a castle, five temples, a triumphal arch and at least one large stadium, connected by roads and water channels, according to Masaaki Kimura, a marine geologist at the University of the Ryukyus.