Seoul is surrounded by over 30 mountains with the most noticeable one, Namsan Mountain, right in the middle of the city. Seoul also has many parks and other outdoor activities, Unesco World Heritage sites and cultural treasures throughout the city.
You may not notice it right away, but Seoul is full of nature. The Han River, beautiful parks, streams and mountains. The Cheonggye Stream in downtown Seoul is a great example of a breathing space that fits in seamlessly with the urban landscape. Some places are a little harder to find. Take Samneung Park for example, a hidden jewel in the middle of Gangnam business district, Samseongdong, housing several royal tombs, and definitely worthy of a visit. A great place to relax after shopping at nearby COEX or Gangnam Station.