Photo: Seoul Metropolitan Government (KOGL)
돈의문역사관
Museum · Jongno-gu
A restaurant turned museum.
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Source: museum.seoul.go.kr
Donuimun Museum Village
FreeMuseum · Seodaemun Stn. / Gwanghwamun Stn. (Line 5)
A modern-era alley village recreating the old Saemunan neighbourhood. Free entry to retro tearooms, comic book rooms and a cinema, and a great spot for vintage photos.
Gyeongagjang
FreeCulture space · Seodaemun Stn. (Line 5)
Where Kim Gu worked and was assassinated. Restored to its original form inside Kangbuk Samsung Hospital, free to visit.
Gyeonghuigung Palace
FreeHistoric site · Seodaemun Stn. (Line 5)
A designated historic site, Gyeonghuigung served as a secondary palace in the late Joseon period.
Seoul Museum of History
FreeMuseum · Gwanghwamun Stn. / Seodaemun Stn. (Line 5)
A free museum on Seoul's transformation from the Joseon era to the present. The old Tram No. 381 outside is a photo favourite.
National Weather Museum
FreeMuseum · Dongnimmun Stn. (Line 3)
Joseon-era rain gauges and more than a century of Seoul weather records. Far more rewarding if you book the free guided tour.
April 19 Revolution Memorial Library
FreeLibrary · Seodaemun Stn. (Line 5)
Public library in Jongno-gu. Free entry and reading, with heating and air conditioning.
National Museum of Korea
Partly freeYongsan-gu · Ichon Stn. (Line 4, Gyeongui-Jungang Line)
Korea's largest museum, with all permanent galleries free. The spacious lobby and Reflecting Pond garden are good for a rest, and Wednesday and Saturday evening openings are quieter.
National Folk Museum of Korea
FreeJongno-gu · Gyeongbokgung Stn. / Anguk Stn. (Line 3)
A free museum of Korean daily life. The outdoor Memory Street and children's museum make it great for families.
National Museum of Korean Contemporary History
FreeJongno-gu · Gwanghwamun Stn. (Line 5) Exit 2
A free modern history museum facing Gwanghwamun Square. Insider tip: the rooftop viewpoint takes in Gyeongbokgung and the square at a glance.
Postage Stamp Museum
FreeJung-gu · Euljiro 1-ga Stn. (Line 2) Exit 6, Myeongdong Stn. (Line 4) Exit 5
A compact free museum on the history of stamps. In the middle of Myeong-dong, so it's a handy escape from the heat or cold.

Korean Film Museum
FreeMapo-gu · Digital Media City Stn. (Line 6, Airport Railroad, Gyeongui-Jungang Line)
Free museum covering 100 years of Korean cinema. The on-site film archive library screens classics at no charge.