iBuilt by Imperial Japan in 1908 as Gyeongseong Gamok, this red-brick prison held Korean independence activists, including the teenage martyr Yu Gwan-sun, through 80 years of colonial rule, division and dictatorship before closing in 1987. Eleven original buildings survive, including cell blocks, an underground torture chamber, watchtowers and the execution building with its hidden body-removal tunnel. Since 1998 the site has operated as a history museum and memorial park confronting Korea's independence struggle and modern political history.
The former workhouse where inmates were forced to manufacture goods for prisons, the military and government offices, including munitions during the late 1930s.

The 1923 administration building housing the Prison History Room, three National Resistance rooms of independence-fighter relics, and the underground interrogation room with original torture implements.

A two-storey 1920s cell block built to confine political prisoners opposing Japanese rule; its walls still show bullet damage from Korean War fighting.

An overview of daily prison life at Seodaemun, covering the institution's organisation, guard monitoring systems, and the inmates' daily schedule.

Original cell blocks that held independence and democracy activists; visitors can enter the cells and see the tap-code system prisoners used to communicate.
251 Tongil-ro, Seodaemun-gu, Seoul, South Korea
Nearest station: Dongnimmun Station (Line 3, Exit 5)
Show on mapDifferent hours until 31 December, 09:30–17:00
| Mon | Closed |
| Tue | Closed |
| Wed | Closed |
| ThuToday | Closed |
| Fri | Closed |
| Sat | Closed |
| Sun | Closed |
From ₩3,000
Teens (13-18) ₩1,500; children (7-12) ₩1,000; seniors 65+ and infants under 7 free; groups of 20+ get 20% off
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