Korea is a rather small country. In fact, it's possible to travel from Seoul in the north to Busan on the southern coast in a matter of a few hours by KTX, the nation's high speed train. So technically, any city could possibly be classified a day trip. However, there are a few destinations located particularly close to the capital and are all accessible by Seoul's efficient and affordable subway, making them the perfect day trips to get a feel for life outside the big city. Check them out below.