Photo: Wikimedia Commons (CC BY-SA)
성동구립용답도서관
Library · Seongdong-gu
Public library in Seongdong-gu. Free entry and reading, fully heated and air-conditioned.
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Source: www.sdlib.or.kr
Yongdap Sports Center
₩4,000Sports facility · Yongdap Stn. (Line 2)
Public indoor pool in Seongdong-gu with a 5-lane adult pool. Open swim 4,000 won per session, and there is a gym on site. Session times change monthly, so check before you go.
Seoul Youth Center Seongdong
FreeStudy & youth space · Majang Stn. (Line 5)
A lounge, study and community space free for all young people, part of the Seoul Youth Center Orang network.
Hanyang Women's University Art Museum
FreeArt gallery · Yongdap Stn. (Line 2)
Haengwon Gallery, located on the 1st floor of the library.
Majang National Sports Center
₩4,000Sports facility · Wangsimni Stn. (Lines 2, 5, Suin-Bundang Line, Gyeongui-Jungang Line)
Public indoor pool in Seongdong-gu. Six-lane 25m adult pool. Open swim is 4,000 won per session. There is also a gym. Open swim time slots change monthly, so check before you go.
Seoul Sewerage Science Museum
FreeMuseum · Yongdap Stn. (Line 2)
Built atop a working sewage treatment plant, with views of the underground facilities. A good rainy-day outing for kids.
Jungnang Water Recycling Center Badminton Court
FreeSports facility · Janghanpyeong Stn. (Line 5)
Indoor badminton court in Seongdong-gu. 3 courts.

Seoul Metropolitan Library
FreeJung-gu · City Hall Stn. (Lines 1, 2)
A landmark right in front of Seoul Plaza. Known for its stepped bookshelves and glass-walled plaza views, with a rooftop and cafe for a break.
Starfield Library
FreeGangnam-gu · Samseong Stn. (Line 2), Bongeunsa Stn. (Line 9)
Famous for its 13m-high shelves, this is a photo hotspot inside COEX Mall. Ideal escape from summer heat and winter cold, with plenty of seating.
Jeongdok Public Library
FreeJongno-gu · Anguk Stn. (Line 3)
A campus-style library on the Bukchon hillside. A healing spot where you can picnic on garden benches among spring cherry blossoms and autumn leaves.

Namsan Library
FreeYongsan-gu · Myeongdong Stn. / Hoehyeon Stn. (Line 4)
A library atop a stairway on the slopes of Namsan. Read a book, then walk straight on to Namsan Park and N Seoul Tower on a free route.
Jongno Library
FreeJongno-gu · Gyeongbokgung Stn. (Line 3)
On the edge of Sajik Park and Inwangsan. Read, then stroll the park; pair it with Gyeongbokgung for a full day.