Dongdaemun

DDP is Seoul's most futuristic landmark — a sweeping, curved structure clad in tens of thousands of aluminum panels, designed by Zaha Hadid and opened in 2014 on the site of the old Dongdaemun Stadium. It's built with almost no straight lines, giving it a "landscape" feel rather than a typical building. Construction uncovered old Joseon-era fortress remains, now on display in a small basement museum.

Dongdaemun is Seoul's largest fashion wholesale district, known for running almost around the clock — but "day" and "night" here mean two different shopping experiences.