Itaewon Children's Park

Leeum Museum of Art

An art museum run by the Samsung Foundation of Culture. The standing exhibition of historic Korean art is free and the special exhibitions are ticketed, priced per show rather than at a standing rate. From exit 1 of Hangangjin Station, the route runs 100 metres towards Itaewon, then turns right into the first alley for an uphill walk of about five minutes.

War Memorial of Korea

Closes at 17:40, not 18:00, and stops admitting visitors at 17:00 — a 40-minute gap that catches people who arrive after an afternoon elsewhere. Closed Mondays, and when a holiday falls on a Monday the closure moves to the day after, which is the rule most itineraries miss.

N Seoul Tower

Time the visit around sunset if you want both daylight and night views, and plan the ascent separately from the observatory ticket.

National Museum of Korea

Two closure rules, not one, and they are not the same thing: the museum itself shuts on only three days a year, while the permanent galleries take a quarterly Monday off with the garden still open. Wednesday and Saturday run to 21:00 — the only evenings you can see this place without daylight pressure.