Built using mathematical treatises on fortress design in 1796, this walled city incorporated Western and Eastern military science. Its construction manual survives, detailing engineering calculations.
Lance Vanlewen, CC BY-SA 4.0, via Wikimedia Commons
A Fortress from a Blueprint
Hwaseong Fortress is an 18th-century military structure planned with scientific precision. The construction, which took place between 1794 and 1796 under King Jeongjo of the Joseon Dynasty, was guided by principles of the Silhak, or "Practical Learning," movement. This school of thought promoted the use of science and industry for societal development. The fortress was designed by the scholar Jeong Yak-yong, who consulted both Eastern and Western military and scientific texts.
The entire project is documented in a ten-volume report called the Hwaseong Seongyeok Uigwe, published in 1801. This comprehensive manual contains everything from blueprints and engineering methods to material lists, budgets, and worker timetables. It details the dimensions for every structure, the cost of materials, and even the wages paid to the 700,000 mobilized workers. This level of detailed documentation was precise that it allowed for accurate restoration of the fortress after it sustained damage during the Korean War. The existence of this manual was the reason for UNESCO's designation of the fortress as a World Heritage site in 1997.
Engineering an 18th-Century Superstructure
The construction of Hwaseong Fortress, originally projected to take ten years, was completed in just under 33 months. This efficiency was a direct result of new technologies developed by Jeong Yak-yong. He invented a crane-like device called the Geojunggi, which used a system of pulleys to allow a single worker to lift stones weighing up to 240 kilograms. The design was based on principles found in texts on Western technology. Other new machines included the Nokro, a winch for lifting heavy objects, and specialized carts for transporting materials.
The fortress wall itself combines materials and design. It stretches for 5.74 kilometers and stands between four and six meters high. The wall combines traditional granite and earth with fired bricks (byeokdol), a material that better resisted cannon fire by localizing damage. Along the wall are 48 defensive facilities, including command posts, observation towers, firearm bastions, and secret gates. One innovation was the Gongsimdon, a hollow brick watchtower with openings for firing cannons and other weapons, a feature not seen in Korea before. The placement of every gate, turret, and arrow-launching platform was calculated for defensive effectiveness, creating overlapping fields of fire.
💡Fun Facts
The construction manual is so detailed it includes diagrams of the machines invented for the project and a full accounting of worker wages.
Unlike most state projects of the era which relied on forced labor, workers at Hwaseong were paid fair wages from the national treasury.
The fortress was built by King Jeongjo to honor his father, Crown Prince Sado, who had been executed by being locked in a rice chest.
The fortress’s main gate faces north toward the capital, Seoul, which is unusual for Korean fortresses that typically have their main gate facing south.
The fortress grounds are largely integrated with the city and accessible at all times, but specific facilities like the Hwaseong Haenggung (Temporary Palace) operate from 09:00 to 18:00.
Admission
An integrated ticket provides access to Hwaseong Fortress, the Temporary Palace, Suwon Museum, and Suwon Hwaseong Museum. Adult admission is around 4,000 won.
Accessibility
The terrain includes both flat ground and hills along the fortress wall. A tourist trolley is available for visitors to tour the main features.
