Photo: Seoul Metropolitan Government (KOGL)
한국천주교순교자박물관
Museum · Mapo-gu
A museum in Hapjeong-dong, Mapo-gu commemorating Catholic martyrs, covering the Byeongin Persecution (1866
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Source: www.jeoldusan.or.kr

Jeoldusan Martyrs' Shrine
FreeHistoric site · Hapjeong Stn. (Lines 2, 6) Exit 7
A Catholic martyrdom shrine on a hill overlooking the Han River. River views from the quiet garden and sculpture walk, close to Hapjeong and Hongdae.
Foreigners' Cemetery Park
FreePark · Hapjeong Stn. (Lines 2, 6)
Some 20 benches and other amenities line the paths between the graves, making this an ideal spot for a walk and quiet reflection, while the headstones introduce foreign figures who contributed to Korea's development and their stories. There are also trees more than a hundred years
Seoul Youth Center Mapo
FreeStudy & youth space · Hapjeong Stn. (Lines 2, 6)
A lounge, study and community space free for all young people, part of the Seoul Youth Center Orang network.
Seoul Living Culture Center Seogyo
FreeCulture space · Hapjeong Stn. (Line 2)
A hub for young artists near Hongdae, with dance and music practice rooms and multipurpose spaces available to borrow for free.
Mangwon Hangang Park Basketball Court 2
FreeSports facility · Mangwon Stn. (Line 6)
Free outdoor basketball court inside Mangwon Hangang Park. Two courts, No. 1 and No. 2, open 06:00–20:00. Best to avoid slots booked by teams.
Choi Kyu-hah House
FreeHistoric site · Mangwon Stn. (Line 6)
National Registered Cultural Heritage No. 413 / Built in 1972.
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.
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.