Seoul Subway Line 2 (Circle Line)
The world's third-longest subway loop moves 2.2 million people a day — ride the full 48.8 km circle to watch Seoul shift from downtown to Gangnam and back.
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Line 2 is the fastest cross-section of modern Seoul: one unbroken loop links the city centre, Gangnam, Teheran Valley, and the COEX complex with trains arriving every 2 minutes 18 seconds at peak. No transfer needed; just stay on and watch the city change through the windows.
What to look for
- The 1.3 km concrete Dangsan Railway Bridge between Dangsan and Hapjeong stations, rebuilt from a steel girder original and reopened in 1999 — the train crosses the river here
- Seolleung station, where Homeplus opened the world's first virtual supermarket in 2011
- Platform screen doors at every station — Yongdu station on the Seongsu Branch was the first in the entire Seoul Subway system to have them
Off-peak trains run every 5-6 minutes; a full loop is 48.8 km and requires no transfers to reach Gangnam or COEX.
Seoul Subway Line 2 (Circle Line) is one of 28 sights worth the detour in Seoul, all bundled offline in Voyage GO — download the Seoul pack and it sits on your map with no signal, filling your travel passport the moment you walk past.
More to see in Seoul
- ChangdeokgungThe kings kept skipping the official palace to live here instead — and they had centuries to prove the point.
- Seoul Metropolitan SubwayLine 1 launched in 1974 tracing Tokyo's blueprint; today 24 lines stretch over 100 km beyond the capital into rural Chungnam and Gangwon provinces.
- JongmyoSpirit tablets of Joseon kings still receive ritual offerings here, exactly as they have since 1394.
- Blue House (Cheong Wa Dae)South Korea's seat of presidential power since 1948 — a 62-acre compound so secure it was once called one of Asia's most protected official residences, until the gates briefly opened to everyone.
- Namdaemun (Sungnyemun)Built in 1398, burned by an arsonist in 2008, and painstakingly restored by 2013 — Seoul's southern gate has a complicated relationship with fire.
- National Museum of KoreaDuring the Korean War, staff packed 20,000 objects and moved them to Busan — that collection now fills the flagship museum of Korean history and art in South Korea.