Photo: Wikimedia Commons (CC BY-SA)
서울어린이대공원
Park · Gwangjin-gu
A large city park with a free zoo, botanical garden, fountains and walking paths. You can spend a whole day here without the paid rides.
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Source: sisul.or.kr
Gwangnaru Safety Experience Center
FreeCulture space · Children's Grand Park Stn. (Line 7)
A free hands-on center where you experience earthquakes, fires and typhoons. Next to Children's Grand Park, so it works as a one-day outing.
Seoul Youth Center Gwangjin
FreeStudy & youth space · Children's Grand Park Stn. (Line 7)
A lounge, study and community space free for all young people, part of the Seoul Youth Center Orang network.
Sejong University Museum
FreeMuseum · Children's Grand Park Stn. (Line 7)
When the school was reorganized as Sejong University in 1979, the museum was renamed the Sejong Museum.
Gunja-dong Library
FreeLibrary · Gunja Stn. (Lines 5, 7)
Public library in Gwangjin-gu. Free entry and reading, with heating and air conditioning.
Achasan Mountain
FreeMountain & trail · Achasan Stn. (Line 5)
A gentle 287m hill good for beginners and families. Goguryeo fortress remains, Han River views, and one of Seoul's top sunrise spots.
Konkuk University Museum
FreeMuseum · Konkuk Univ. Stn. (Lines 2, 7)
Founded in March 1963 as one of the university's basic cultural institutions, it collects, preserves and exhibits historical artifacts bearing the spirit of our ancestors, serving the university's faculty and staff
Seoul Forest
FreeSeongdong-gu · Seoul Forest Stn. (Suin-Bundang Line)
A large ecological park in the middle of the city. Lots of mature trees, shade and benches, with drinking fountains and toilets throughout, so summer walks are comfortable.
Gyeongui Line Forest Park
FreeMapo-gu · Hongik Univ. Stn. (Line 2, Airport Railroad, Gyeongui-Jungang Line)
A 6.3 km linear park on a former railway. The Yeonnam-dong stretch, nicknamed Yeontral Park, strings together shade, lawns and cafes. Few drinking fountains, so bring water.
Seoullo 7017
FreeJung-gu · Seoul Station Stn. (Lines 1, 4, Airport Railroad, Gyeongui-Jungang Line)
An elevated garden walkway converted from an old overpass, with planters, benches, a foot bath and drinking fountains. Lovely at night, so an evening stroll beats midday.
Naksan Park
FreeJongno-gu · Hyehwa Stn. (Line 4)
A hilltop park along the Seoul City Wall trail, known for city night views and sunsets. Carry water for the climb.
Seonyudo Park
FreeYeongdeungpo-gu · Seonyudo Stn. (Line 9)
An ecological park on an island in the Han, built from a former water treatment plant. Ivy-covered structures and green gardens, reached by the Rainbow Bridge, with many shaded paths.