The pre-eminent Buddhist temple within downtown Seoul, Jogyesa is the seat of the Jogye order of Korean Buddhism, and makes an excellent stop while you're in the central Gwanghwamun / Insadong neighborhood. I've taken lots of visitors to the city to this small, pretty collection of traditional pavilions, with their enormous ornate Buddhas, but my fondest memories of it come from the yearly "Lantern Festival" for Buddha's birthday each spring, when the courtyard is hung with thousands of colorful paper lanterns, casting rainbow-colored shadows and transforming the space with a festive atmosphere. The lanterns are normally up for a month on either side of the holiday, which varies with the lunar calendar.