You might think winter nights in Seoul are quiet, best kept indoors, but head downtown to Cheonggyecheon Stream and Gwanghwamun Square and you’ll see dazzling lights glowing in the dark. The Seoul Lantern Festival (서울빛초롱축제) is an exhibition of traditional hanji lanterns and vivid LED installations on the most popular stream in downtown Seoul, Korea. Free to visit, and perfect for slow night strolls and photos, the festival has run since 2009 and now draws millions each winter in Korea with displays and light shows. If you’ll be in Seoul this December, save the dates on your calendar and make sure to visit to see the colorful displays. (This post…