It was a 15 minute walk away from the Seolleong Subway Station, and I read in a blog to check this preserved place out before "getting hammered in Gangnam". The place surrounding it is very modern, but I am impressed that the Korean government followed through to preserve this as a park, very well taken care of.
Large outdoor space with a lot of trees and green hills, and although you cannot climb onto the top of the mound to see everything, this is still a great site for historical buffs. The pamphlet at the entrance helps to explain whose tombs these were and what the gates, shrines, and pathways mean. There were groups of school students when I went and spending time there was lovely as a change to Seoul's towering modern buildings around it.
There is also a 500 year old gingko tree beside the guardhouse. Great sight and not too overcrowded like other touristy places. Do check it out to relax.More