Youth culture, books, and a green railway path

Hongdae Playground is a small public square in front of Hongik University in Mapo District, Seoul, that has long served as the informal heart of the Hongdae neighborhood's indie art and music scene. On weekend afternoons the square and the surrounding walking street host the long-running Hongdae Free Market, where young artists and craftspeople sell handmade goods, alongside impromptu busking performances by musicians and dance crews. The square is surrounded by cafes, live clubs, and streetwear shops that make Hongdae one of Seoul's best-known youth culture districts.

Gyeongui Line Book Street is a pedestrian book-themed promenade built atop a disused stretch of the old Gyeongui railway line near Hongik University Station in Mapo District, Seoul. Opened in 2016, the roughly 250-metre street is lined with bookshop-style pavilions, publisher pop-ups, secondhand book stalls, cafes, and small outdoor reading nooks, making it a popular spot for browsing books and taking photos. The street connects directly into the longer Gyeongui Line Forest Park, forming a continuous green, book-and-cafe-lined walking route through the neighborhood.

Gyeongui Line Forest Park is a long, narrow linear park built along a decommissioned section of the Gyeongui railway line running through Mapo District, Seoul, connecting the Hongdae, Yeonnam-dong, and Sinsu neighborhoods. Nicknamed 'Yeontral Park' by locals as a play on Yeonnam-dong and New York's Central Park, its Yeonnam-dong stretch in particular is lined with trendy cafes, restaurants, and picnicking lawns that draw large weekend crowds. The park's tree-lined paths and pockets of green space make it one of Seoul's most popular urban strolling and picnic spots.