Cheomseongdae, Gyeongju, South Korea  Cheomseongdae(첨성대) is a astronomical observatory which is built between B.C. 632 ~ 647 in Shilla Period. This is one of the oldest astronomical observatory in East Asia.

Cheomseongdae, Gyeongju, South Korea 

Cheomseongdae(첨성대) is a astronomical observatory which is built between B.C. 632 ~ 647 in Shilla Period. This is one of the oldest astronomical observatory in East Asia.