Wikipedia
Cheomseongdae
Cheomseongdae is an astronomical observatory in Gyeongju, South Korea. Cheomseongdae means star-gazing tower in Korean. Cheomseongdae is the oldest surviving observatory in the world. It dates to the 7th century to the time of kingdom of Silla, whose capital was Seorabeol, or present-day Gyeoungju. Cheomseongdae was designated as the country's 31st national treasure on December 20, 1962.