Korea is home to many prehistoric dolmens. They were burial structures in the Stone Age, and are found in a number of clusters. Ganghwa Island has a few hundred, and this is one of the largest, and the best known of them all.
Ganghwa Island's dolmens are now designated as UNESCO Heritage Sites. A few amenities were set up in recent years to better inform the visitors and cater to their needs (toilets, etc).
Although there are a few buildings and villages visible nearby, the feeling here is quite stark, much like Salisbury Plains, England, where Stonehenge stands. It is also appropriate to make this one of the last sights of my Korean drive of 2008, as Stonehenge was the last sight of my English drive of 1998.