กแ Seoul is the capital and largest city of South Korea.
With a population of over 10 million, it is one of the world's largest cities
i. World Heritage sites (Gyeonbokgung, Ghandeokgung, etc)
http://www.royalpalace.go.kr

ii. Han River (512 km length, 2km width)
http://english.seoul.go.kr/han-river-info

iii. Modern Cityscape(Seoul Tower, the World Trade Center, the 63 Building, etc)
http://www.nseoultower.co.kr

iv. Lotte World Tower(The gigantic vertical metropolis with 123 floors and 555M height)
http://www.lwt.co.kr