Photo: Wikimedia Commons (CC BY-SA)
자양한강도서관
Library · Gwangjin-gu
Public library in Gwangjin-gu. Free entry and reading, with heating and air conditioning.
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Source: www.gwangjinlib.seoul.kr
Ttukseom Hangang Park Basketball Court
FreeSports facility · Jayang Stn. (Line 7)
Free outdoor basketball court inside Ttukseom Hangang Park. Three courts, No. 1 to No. 3 (No. 3 is a wheelchair basketball court), open 06:00–20:00. Best to avoid slots booked by teams.
Ttukseom Hangang Park Badminton Courts
₩2,000Sports facility · Jayang Stn. (Line 7)
Outdoor badminton courts in Gwangjin-gu. 5 courts.
Ttukseom Hangang Park
FreePark · Ttukseom Resort Stn. (Line 7)
Free. Ground-level musical fountain plus a nighttime water screen show. Splashing by day, projected fountain shows over the Han River by night.
Ttukseom Jabeolle (Observatory Culture Complex)
FreeViewpoint · Ttukseom Resort Stn. (Line 7)
A free viewing lounge overlooking the Han River from a 240m cylindrical glass building. River and bridge night views through full-height glass.
Gwangjin Culture and Arts Center
₩3,500Sports facility · Konkuk Univ. Stn. (Lines 2, 7)
Public indoor pool in Gwangjin-gu with a 6-lane, 25m adult pool, children's and toddler pools, and a warm bubble pool. Facilities include a water basketball hoop, a toddler slide and water polo goals. Open swim 3,500 won per session. Session times change monthly, so check before you go.
Jayang 4-dong Library
FreeLibrary · Jayang Stn. (Line 7)
Public library in Gwangjin-gu. Free entry and reading, with heating and air conditioning.

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.