홍은도담도서관
Library · Seodaemun-gu
Public library in Seodaemun-gu. Free entry and reading, fully heated and air-conditioned.
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Source: lib.sdm.or.kr
Hongje Basketball Court
FreeSports facility · Hongje Stn. (Line 3)
Outdoor basketball court in Seodaemun-gu. 1 court.
Hongje Yuyeon
FreeCulture space · Hongje Stn. (Line 3)
A public art space that revived the Hongje Stream channel beneath Yujin Shopping Center through media art. A waterside walkway following eight works of night lighting and installation art.
Zero Gravity Zone Hongje
FreeStudy & youth space · Hongje Stn. (Line 3)
A lounge, study and community space free for all young people, part of the Seoul Youth Center Orang network.
Seoul Metropolitan Office of Education Seodaemun Library
FreeLibrary · Hongje Stn. (Line 3)
Public library in Seodaemun-gu. Free entry and reading, fully heated and air-conditioned.
Baengnyeon Neighborhood Park
FreePark · Saejeol Stn. (Line 6)
The ridge running from the summit of Baengnyeonsan (215.5 m) divides Seodaemun-gu from Eunpyeong-gu. The mountain is named after Baengnyeonsa temple on its southeast side, and since old times, with Cheongnyeonsa to the east and Sammaksa to the south
Ansan Urban Nature Park
FreeMountain & trail · Muakjae Stn. (Line 3)
Rising 295.9 m above sea level, Ansan slants west from Inwangsan, forming the Muakjae pass before rising again. Muakjae, another name for Gilmajae, was also called Moakjae, and when the Joseon dynasty was founded and the capital moved to Hanyang

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.