Stock Photo - Cheomseongdae is the oldest existing astronomical observatory in Asia.Constructed during the reign of Queen Seon-deok (r. 632-647), it was used to observe stars in order to forecast the weather. This stone structure is a beautiful combination of straight lines and curves, and was designated as National Treasure No.31 on December 20th, 1962.Cheomseongdae was built in a cylinder shape with stones 30cm in diameter. 362 stones were piled up to make 27 levels. Roughly 4.16m up from the bottom there is a 1? square entrance and a space to hang a ladder under it.

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