COEX Mall & Starfield Library

COEX is the largest underground shopping mall in Asia — a subterranean city beneath the Gangnam convention district that houses over 300 shops, a multiplex cinema, an aquarium, and the Starfield Library, which has become the most photographed interior space in Seoul. The library is a two-storey open-air reading space in the centre of the mall, lined with 50,000 books on shelves that reach 13 metres toward a skylit ceiling, and the visual effect — a cathedral of literature in the middle of a shopping complex — stops every passerby in their tracks.

The Starfield Library was designed as a public space within a commercial environment, and it works — people actually sit and read, students study at the communal tables, and the combination of architectural drama and genuine functionality has made it a gathering point that elevates the mall from commerce to community. The book collection spans Korean and English-language titles, and rotating exhibitions and author events use the library's dramatic backdrop to draw audiences that a conventional bookshop could never attract.

COEX Mall itself is a navigational challenge — the underground corridors connect to multiple subway stations, hotels, and the COEX Convention Center without obvious surface-level landmarks, and first-time visitors routinely get lost. But the scale is part of the appeal: COEX represents the Korean approach to commercial infrastructure at its most ambitious, and the underground aquarium, K-pop merchandise shops, and food court (which includes branches of several famous Seoul restaurants) make it a destination that could consume an entire rainy afternoon.