Photo: Wikimedia Commons (CC BY-SA)
등빛도서관
Library · Gangseo-gu
Public library in Gangseo-gu. Free entry and reading, with heating and air conditioning.
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Source: lib.gangseo.seoul.kr
Seonangdang Neighborhood Park Basketball Court
FreeSports facility · Gayang Stn. (Line 9)
Outdoor basketball court in Gangseo-gu. 1 court. Open 24 hours.
Gangseo Olympic Community Sports Center
₩3,300Sports facility · Gayang Stn. (Line 9)
Public indoor pool in Gangseo-gu. Seven-lane adult pool (1.2–1.5m deep) and a toddler pool (0.6m). Open swim is 3,300 won per session. There are also a gym, table tennis courts and badminton courts. Open swim time slots change monthly, so check before you go.
Ujangsan Neighborhood Park
FreePark · Balsan Stn. (Line 5)
In the centre of Gangseo-gu, a park where woodland, art spaces and sports facilities come together within the city. The mountain's name comes from the rain rituals the Yangcheon magistrate once held here during droughts. The rite was performed three times...
Heojun Museum
Free if eligibleMuseum · Gayang Stn. (Line 9)
A Gangseo-gu district museum on the life of Heo Jun, author of the Donguibogam, and on Korean medicine. Visit on a free day and it costs nothing.
Space K Seoul
₩8,000Art gallery · Magok Stn. (Line 5)
Space K is Kolon's arts and culture sharing space, established in 2011.
Seoul Botanic Park
Partly freePark · Magongnaru Stn. (Line 9, Airport Railroad)
A large botanical park in Magok. The wide lawns, lake and wetland walks are free, and there's plenty to see even if you skip the paid greenhouse.

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.