Yeonghwiwon & Sunginwon Burial Mounds is an important part of the area's heritage. Look out for any epitaphs which are often a bounty of historical facts.
To explore this burial ground, make your way to Dongdaemun-gu. There are loads of other things to see in this area, like Gyeongbokgung Palace, Dongdaemun History and Culture Park, and National Museum of Korea.