Seoul has several indoor markets that are perfect for a rainy day. Namdaemun Market is one of the largest and oldest, with over 10,000 vendors selling everything from clothing to souvenirs. Gwangjang Market is another great option, with a focus on food. You can sample traditional Korean dishes like bindaetteok (mung bean pancakes) and bibimbap (mixed rice with vegetables and meat). Whatever your interests, there's an indoor market in Seoul that's sure to keep you entertained.