How Did Ancient Koreans Keep Ice Frozen in Summer? The Secret of Seokbinggo
Imagine a refrigerator made of stone that works without electricity! During the Joseon Dynasty, Koreans built natural icehouses called Seokbinggo to store winter ice all the way until late summer.
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| 출처 - 문화재청, 국가유산포털(https://www.heritage.go.kr) |
👌How did it work? It relies on four simple natural principles:
1. It Was Built Underground
Just like stepping into a deep cave on a hot summer day, the earth beneath the ground stays naturally cool. Seokbinggo was built semi-underground, using the earth’s natural temperature to block external summer heat.
2. It Wore a "Natural Blanket"
To keep the ice blocks from melting or sticking together, workers wrapped them in rice straw, charcoal, and soil. On top of the stone roof, they piled thick dirt and planted green grass. The grass acted as a natural sunshade, absorbing sunlight before heat could get inside.
3. Warm Air Escapes Through Roof Vents
The inside of a Seokbinggo has an arch-shaped ceiling (like a rainbow) with small chimneys at the very top.
Science principle: Hot air rises, while cold air stays down.
As warmer air drifted up toward the ceiling, it escaped through the top vents. This kept the cold air trapped at the bottom around the ice.
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출처 - 문화재청, 국가유산포털(https://www.heritage.go.kr) |
4. Fast Water Drainage
Meltwater is the worst enemy of ice—if water sits near ice, it melts even faster! To fix this, the floor of Seokbinggo was sloped with a drainage channel. Any melted water quickly flowed out of the building, keeping the inside dry and cold.
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| 출처 - 문화재청, 국가유산포털(https://www.heritage.go.kr) |
💡 In short: By combining underground natural cooling, straw insulation, roof vents for hot air, and quick water drainage, ancient Koreans created a smart, eco-friendly icehouse centuries ago!
🏛️ Gyeongju Seokbinggo (Ancient Stone Icehouse)
📍 Location
Address: Inwang-dong, Gyeongju-si, Gyeongsangbuk-do, South Korea (Located inside the ancient Wolseong Fortress site)
Nearby Landmarks: Cheomseongdae Observatory, Donggung Palace and Wolji Pond, Hwangridan-gil Street.
🚌 How to Get There from Gyeongju Station (KTX / SRT)
By City Bus (Recommended / Approx. 25–35 mins)
- Head to the bus stop right outside Gyeongju Station (Singyeongju Station).
Board Bus No. 50, 51, 60, or 700.
- Get off at the Wolseong / Cheomseongdae (월성/첨성대) or Donggung & Wolji (동궁과월지) bus stop.
- Walk about 5–10 minutes along the scenic park path into Wolseong Hill.
2. By Taxi (Approx. 20 mins)
Take a taxi from the station queue directly to "Gyeongju Wolseong (경주 월성)" or "Cheomseongdae (첨성대)".
Fare: Approximately 15,000 – 20,000 KRW.
3. From Gyeongju Express / Intercity Bus Terminal
- Take Bus No. 10 or 11 (Approx. 10–15 mins) or take a pleasant 25-minute walk through the central historic area.
🌟 Tour Highlights & Travel Features
1. Designated National Treasure (Treasure No. 66)
- Built in 1738 (Joseon Dynasty), this is one of the best-preserved ancient stone icehouses in South Korea. It showcases the brilliant natural engineering of ancient Koreans who preserved winter ice late into hot summers without modern electricity.
- Nestled gently on the green slopes of Wolseong Fortress, its exterior resembles a quiet grassy mound. Looking inside through the entrance, you can marvel at the impressive arched granite structures and air ventilation shafts.
3. Seamless Historic Walking Route
- Seokbinggo is located at the center of Gyeongju's main historic zone. You can easily visit Cheomseongdae, Gyerim Forest, Daereungwon Ancient Tombs, and Donggung Palace & Wolji Pond all on foot in a single morning or afternoon.
- The surrounding area features flat, beautifully paved paths lined with seasonal flowers (canola flowers in spring, lotus in summer, pink muhly in autumn). It is one of the most popular spots in Gyeongju for renting a bicycle or taking a night walk.
💡 Visitor Information
Opening Hours: Open 24/7 (Outdoor monument area)
Admission Fee: Free
Best Time to Visit: Late afternoon to sunset (when the golden hour light hits Wolseong Hill and the nearby monuments light up).
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