thumb|right|upright|Cheomseongdae, the oldest surviving astronomical observatory in Asia One of the best known artefacts of Korea's history of science and technology is the Cheomseongdae, a 9.4-meter high astronomical observatory built in 634.
thumb|right|upright|Cheomseongdae, the oldest surviving astronomical observatory in Asia One of the best known artefacts of Korea's history of science and technology is the Cheomseongdae a 94-meter high astronomical observatory built in 634.