관악구민종합체육센터
Sports facility · Gwanak-gu
Public indoor pool in Gwanak-gu. Six-lane adult pool and a two-lane toddler pool. Open swim is 3,410 won per session. Open swim time slots change monthly, so check before you go.
Official hours and feesOpen in a map app
Source: sports.seoul.go.kr · Seoul public sports facilities dataset

Nakseongdae Park
FreePark · Nakseongdae Stn. (Line 2)
A park on the birthplace of General Gang Gam-chan. Pair the blue-tiled Anguksa shrine with the free exhibition hall.
Seoul Education Science Center
FreeMuseum · Nakseongdae Stn. (Line 2)
A free science center next to Nakseongdae. With an astronomical observatory and an ecology greenhouse, it fills half a day with kids.
Seoul National University Museum of Art
FreeArt gallery · Seoul Nat'l Univ. Stn. (Line 2) + bus
Contemporary art for free in a cantilevered building designed by Rem Koolhaas. Combine it with a campus stroll.
Seoul National University Museum
FreeMuseum · Gwanaksan Stn. (Sillim Line)
Excavated artefacts from major sites including Jeongok-ri in Yeoncheon, Osan-ri in Yangyang, Heunam-ri in Yeoju, the Goguryeo fortresses around Achasan, and the Seokchon-dong Tombs and Mongchontoseong Fortress in Seoul, along with the Geunyeokhwahwi albums compiled by Oh Se-chang.
Geulbit Information Library
FreeLibrary · Seoul Nat'l Univ. Stn. (Line 2)
Public library in Gwanak-gu. Free entry and reading, with heating and air conditioning.
Gwanak Central Library
FreeLibrary · Gwanaksan Stn. (Sillim Line)
Public library in Gwanak-gu. Free entry and reading, with heating and air conditioning.

King Onjo Culture and Sports Hall
₩4,400Gangdong-gu · Godeok Stn. (Line 5)
Public indoor pool in Gangdong-gu, with a 6-lane adult pool and a toddler pool. Open swim costs 4,400 won per session. Open-swim time slots change monthly, so check before you go.
Jamsil Sports Complex Swimming Pool 1
₩4,000Songpa-gu · Sports Complex Stn. (Lines 2, 9)
Public indoor pool in Songpa-gu, with a 2-lane competition pool (50m x 25m) and a 10-lane diving pool (25m x 25m). Open swim costs 4,000 won per session. Open-swim time slots change monthly, so check before you go.

Olympic Swimming Pool
₩7,000Songpa-gu · Olympic Park Stn. (Lines 5, 9)
Public indoor pool with open swim.
Geumcheon Community Culture and Sports Center
₩4,200Geumcheon-gu · 독산4동
Public indoor pool in Geumcheon-gu. Six-lane adult pool plus a toddler pool. Open swim is 4,200 won per session. Open swim time slots change monthly, so check before you go.
Eunpyeong Community Sports Center
₩4,000Eunpyeong-gu · Gupabal Stn. (Line 3)
Public indoor pool in Eunpyeong-gu. Seven-lane 25m adult pool plus a toddler 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.