Tomb of Munmu of Silla is an underwater tomb, the 30th king of Silla, in Gyeongju, North Gyeongsang Province, South Korea. This is Historic Site No. 158, also known as Daewang-am.
Wikipedia https://en.wikipedia.org/wiki/Tomb_of_Munmu_of_Silla
Official Website http://www.heritage.go.kr/heri/cul/culSelectDetail.do?VdkVgwKey=13%2C01580000%2C37
Address South Korea
Coordinates 35°44'17.263" N 129°29'12.752" E