Haeinsa sits at 655 meters above sea level in Gayasan National Park, nestled into the slopes of a mountain that blocks cold northern winds while its southwest-facing position avoids the damp southeasterly currents rising from the valley below. The temple was founded in 802, according to legend, after two monks of royal Daegaya descent named Suneung and Ijeong returned from Tang China and healed the wife of King Aejang of Silla. In gratitude for the Buddha's mercy, the king ordered the temple's construction. Over the following twelve centuries, Haeinsa grew into one of Korea's Three Jewels Temples, representing Dharma, the Buddha's teachings. It remains the head temple of the Jogye Order of Korean Seon Buddhism and was home to the influential Seon master Seongcheol until his death in 1993.

The Janggyeong Panjeon, the storage hall complex that houses the Tripitaka's woodblocks, is the oldest surviving structure at Haeinsa, and its survival defies probability. The halls escaped the Japanese invasions of 1592-98 untouched. They survived the fire of 1818 that destroyed most of the rest of the temple. In total, the complex has endured seven serious fires. Its closest call came during the Korean War. In September 1951, with North Korean guerrillas operating in the surrounding mountains, Air Force Colonel Kim Young-hwan received orders to bomb the temple. He refused. Leading his squadron of fighter jets directly over Haeinsa, he did not release a single bomb, gambling his career on the conviction that the woodblocks inside were irreplaceable. He was right.

The four halls of the Janggyeong Panjeon are arranged in a rectangle and built with deliberate plainness, their design subordinated entirely to function. The two main halls, Beopbojeon and Sudara-jang, each measure 60 meters long, 8.7 meters wide, and 7.8 meters tall. Windows of different sizes on the north and south walls create natural cross-ventilation using principles of hydrodynamics. The clay floors contain layers of charcoal, calcium oxide, salt, lime, and sand that absorb excess moisture during rainy seasons and release it during dry winters. The clay roof and wooden rafters buffer temperature swings. No part of the complex receives direct sunlight. Animals, insects, and birds avoid the halls for reasons no one has satisfactorily explained. These techniques, intuitive rather than scientific, have kept the woodblocks in pristine condition for more than 750 years, a track record that modern climate control could not match.

Haeinsa is not a museum. Monks still chant in its halls, and the temple operates as an active Seon practice center. Its collection extends beyond the Tripitaka to include national treasures such as a remarkably realistic wooden carving of a monk, Buddhist paintings, stone pagodas, and lanterns. The temple also runs Temple Stay programs that invite visitors to experience Buddhist monastic life firsthand, from meditation sessions to the temple's distinctive vegetarian cuisine. But the Tripitaka remains the reason most people climb the mountain. The 81,352 blocks contain 52 million characters across 6,568 volumes, representing the oldest intact Buddhist canon in Hanja script and one of the most complete collections of Buddhist doctrinal texts in the world. UNESCO inscribed the storage halls as a World Heritage Site in 1995, recognizing not just the texts but the remarkable buildings that have kept them safe.