Building of Bulguksa and Seokguram
Kim Dae-seong, chief minister under King Gyeongdeok, began Bulguksa and the Seokguram grotto on Mount Toham — the summit of unified Silla’s Buddhist art.

Basile Morin · CC BY-SA 4.0 · Source
The Samguk yusa says Kim Dae-seong built Bulguksa for his parents in this life and Seokguram for his parents in a former life; the state completed them after his death in 774. Bulguksa was meant to make the Buddha Land visible on earth, with the Seokgatap and Dabotap pagodas and the Cheongungyo and Baegungyo stairways.
In 1966 repairs to the Seokgatap revealed the Mugujeonggwang Great Dharani Sutra, printed before about 751 and regarded as the oldest surviving woodblock print in the world. Seokguram is an artificial grotto of fitted granite, its domed chamber holding a seated Buddha ringed by bodhisattvas and disciples. Both became World Heritage in 1995.