While the prison closed in 1987, it reopened as a museum and memorial hall in 1998 to commemorate the lives lost in the name of Korean independence. Visitors take a sombre journey through various prison cells, a watchtower, an execution room, a tunnel through which corpses were carried, plus the basement cell where the teenage female prisoner Yu Gwansun was tortured and died. Exhibit areas display photos and video footage of prison conditions, and a memorial outside the building lists the names of the 90 known Koreans who died inside (some 600 are believed to have perished here). A visit to Seodaemun Prison History Hall can be combined with a half-day trip to the Demilitarized Zone (DMZ) for a closer look at two dark periods in South Korean history.