Seokgulam Grotto was built in memory of Kim Dae-seong's parents in 751, the 10th year of King Gyeongdeok's reign, completed over a span of thirty years.
Seokgulam, made of rough and solid granite, has been unparalleled in history.
It was written of the grotto, "A shrine was constructed as if silk were knit with stone." Although not comparable in size to those found in India and China, it excells in terms of art, philosophy and scientific technique.
It was designated as the UNESCO Cultural Heritage on December 6, 1995.
Seokgulam Grotto consists of a square antechamber, a round chamber and a passage connecting the two chambers. It represents the universe, with heaven round and the earth square.
Sculptured in relief on granite slabs, flanking the wall Buddha and the Buddhist world, are eight guardian demons, two Vajurapanis (guardian gods of the temple) and four ferocious guardians.