Overview
Extant archeological evidence of science and technology dating from the Samguk Sidae is unfortunately scarce as much has been lost through the ravages of war and time. What is known about the technologies employed by the three kingdoms again come only from the extant historical records and Chinese and Japanese descriptions of the three Korean kingdoms. It is likely, however, that the technologies the three kingdoms employed were around the level of technological sophistication of the Chinese to the west. This is evidenced in the surviving examples of metallurgy, conststructions, as well as extant structures in both Korea and Japan that were built or designed by Korean artisans of the age. Pottery from this era also suggest that the Korean kingdoms developed sophisticated ceramics production techniques.
Technology and Architecture
Most of the architecture in Korea today date from the Joseon or (to a lesser extent) the Goryeo period; no wooden structures from the Samguk era exists today. Cheomseongdae and the remnants of Hwangnyongsa, however, offer clues on the extent of the three kingdoms' level of sophistication. Both constructed in the ancient Shilla capital at present-day Gyeongju during the reign of Queen Seondeok, the structures are some of the last remaining pieces of evidence of Samguk era scientific and technological capabilities.
Cheomseongdae, a bottle-shaped tower, is regarded as one of the oldest surviving scientific installations in East Asia, served as an observatory for ancient stargazers.
Hwangnyongsa was a large temple complex that featured a nine-story wooden pagoda of gargantuan proportions and is believed to be the largest Korean pagoda ever constructed. The pagoda was engineered by a Baekje architect and stood at a lofty 224 feet and covered an area of 6084 square feet at its base. Although the building no longer exists, descriptions of the pagoda and the surviving foundation stones suggest its enormous size.
Sources:
http://www.orientalarchitecture.com/kyongju/hwangnyongsaindex.htm









