Photo: Wikimedia Commons (CC BY-SA)
국립중앙박물관
Museum · Yongsan-gu
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.
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Source: museum.go.kr
National Hangeul Museum
FreeMuseum · Ichon Stn. (Line 4, Gyeongui-Jungang Line)
※ Closed for one year for renovation.
Yongsan Family Park
FreePark · Seobinggo Stn. (Gyeongui-Jungang Line)
Wide lawns and ponds give this park a Western feel. Japanese troops used the ground as a supply base during the Imjin War (1592-1598), Qing soldiers occupied it during the Imo Incident (1882), and during the Gapsin Coup
Yongsan Youth Center
₩4,000Sports facility · Ichon Stn. (Line 4, Gyeongui-Jungang Line)
Public indoor pool in Yongsan-gu with a 5-lane adult pool and a toddler pool. Open swim 4,000 won per session. Session times change monthly, so check before you go.
Yongsan Park Partially Opened Site
FreePark · Seobinggo Stn. (Gyeongui-Jungang Line)
The first section opened from the returned US military base. You can walk through the former officers' housing Complex 5 just as it was.
Yongsan Children's Garden
FreePark · Sinyongsan Stn. (Line 4)
A wide lawn garden opened on the returned US military base. Free, but advance reservation is required.
Ichon Hangang Park
FreePark · Ichon Stn. (Line 4, Gyeongui-Jungang Line)
A quiet stretch of Han River park connected directly to Ichon Station. Wide lawns and tree shade, with drinking fountains and toilets. Good to combine with the National Museum of Korea.
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.
Seoul Museum of History
FreeJongno-gu · 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 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.