Heonilleung is a cluster of Joseon Dynasty royal tombs, made up of two tombs in Seocho-gu, Seoul. This is where Taejong of Joseon and Sunjo of Joseon are entombed, along with their queens.
Wikipedia https://en.wikipedia.org/wiki/Heonilleung
Official Website http://royaltombs.cha.go.kr/html/HtmlPage.do?pg=%2Fnew%2Fhtml%2Fportal_01_09_01.jsp&mn=RT_01_09
Phone +82 02-445-0347
Coordinates 37°27'56.138" N 127°4'55.206" E