The Banpo Moonlight Rainbow Fountain Bridge is beautiful at night.
By day, it is a very normal bridge, stretching over than Han River, connecting Yongsan and Seocho districts of Seoul.
At night (from April to October), it is transformed into the Banpo Moonlight Rainbow Fountain Bridge. It holds the world record for the longest fountain bridge. The bridge is home to thousands of rainbow LED nozzles that spray out almost 200 tons of water every minute in a show set to music. The water is pumped continuously from the Han River below for 15 minutes.
Schedule (subject to change):
May-June Weekdays : 12:00, 20:00, 21:00
Weekends : 12:00, 17:00, 20:00, 20:30, 21:00, 21:30 July-August Weekdays : 12:00, 20:00, 21:00
Weekends : 12:00, 17:00, 19:30, 20:00, 20:30, 21:00, 21:30 September-October Weekdays : 12:00, 20:00, 21:00
Weekends : 12:00, 17:00, 20:00, 20:30, 21:00, 21:30
For the best view, you should take a Han River cruise. I went on the BBQ buffet/live music cruise (leaves at 7:30PM from Yeouido Park ferry terminal (15,000KRW). Ferry Info
If boats aren't your thing, you can see the bridge from Banpo Hangang Park, but the angle is not quite as good.
Location: Shin-Banpo Station (Line 9), exit 1, turn right and walk to the river (follow signs)