동대문구민체육센터
Sports facility · Dongdaemun-gu
Public indoor pool in Dongdaemun-gu. Six-lane adult pool and a three-lane children's pool. Open swim is 3,700 won per session. There is also a gym. 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
Jangan Neighborhood Park Badminton Court
FreeSports facility · Yongmasan Stn. (Line 7)
Outdoor badminton court in Dongdaemun-gu. 3 courts. Open 24 hours.
Jangan Neighborhood Park Basketball Court
FreeSports facility · Yongmasan Stn. (Line 7)
Outdoor basketball court in Dongdaemun-gu. Basketball court. Open 24 hours.
Baebongsan Forest Library
FreeLibrary · Cheongnyangni Stn. (Line 1, Suin-Bundang Line, Gyeongui-Jungang Line, Gyeongchun Line)
Public library in Dongdaemun-gu. Free entry and reading, with heating and air conditioning.
Baebongsan Neighborhood Park
FreePark · Hoegi Stn. (Line 1, Gyeongui-Jungang Line)
The only hill park and the symbolic park of Dongdaemun-gu, a district short of green space. Once occupied by a military unit, with large rock faces exposed on cut slopes 15–20 m high, the site was turned into a park in 1992. Inside the park, for more than 50 years
University of Seoul Museum
FreeMuseum · Hoegi Stn. (Line 1, Gyeongui-Jungang Line)
The museum surveys, collects, preserves and exhibits materials on Korean and international history, archaeology, folklore and art, as well as cultural properties related to the history of Seoul.
Dongdaemun-gu Dapsimni Library
FreeLibrary · Sindap Stn. (Line 2)
Public library in Dongdaemun-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.