Janggyeong Panjeon, Haeinsa, Hapcheon
Early Joseon depositories that hold the Tripitaka Koreana woodblocks. Their scientific design for ventilation and humidity made them a World Heritage Site in 1995.

SpongeFan0304 · CC BY-SA 4.0 · Source
These buildings at Haeinsa house the Tripitaka Koreana woodblocks; what stands today was largely rebuilt in 1488 (19th year of King Seongjong). Two plain, unadorned halls, Sudarajang in front and Beopbojeon behind, stand side by side.
For airflow, the windows on the front and back walls differ in size top and bottom, and the earthen floor is packed with charcoal, lime and salt to absorb and release moisture. Thanks to this, more than 80,000 woodblocks have survived over 500 years without rotting or warping.
They are a National Treasure and became a UNESCO World Heritage Site in 1995; the woodblocks inside were inscribed on the Memory of the World Register in 2007.
