The Tomb of Queen Seondeok is a round tumulus with a circumference of 73 meters. Aside from the fact that it is circled by a protective two-layer rock, the tomb has no other unique features. As the oldest daughter of King Jinpyeong, Queen Seondeok became the first queen of the Silla Kingdom. During the 16th year of her reign, Bunhwangsa Temple and Cheomseongdae Observatory were built. She also ordered the construction of the famous nine-story wooden pagoda of Hwangyongsa Temple, a significant achievement of Buddhist architecture. While many of her efforts laid the foundation for the unification of Three Kingdoms of Korea, Queen Seondeok’s reign was plagued by rebellion and strife and she died in 647 during a rebellion, 23 years before unification was realized.