Seoul Heolleung (Taejong and Queen Wongyeong) and Illeung (Sunjo and Queen Sunwon) [UNESCO World Heritage]

Heolleung is the tomb of King Taejong (r. 1400–1418), the 3rd monarch of Joseon, and Queen Wongyeong of the Min clan (1365–1420). It is a twin mound tomb (Ssangneung) with two burial mounds placed side by side within a single curved wall. When viewed from the front, the left (west) mound is for King Taejong, and the right (east) mound is for Queen Wongyeong. In 1420 (the 2nd year of King Sejong's reign), Queen Wongyeong passed away first, and her tomb was built at the current site. While constructing her tomb, King Taejong had his own burial site prepared in advance. Two years later, in 1422 (the 4th year of King Sejong's reign), when King Taejong died, his tomb was built to the west of Queen Wongyeong's tomb, resulting in the present arrangement.

Both burial mounds are surrounded by stone screens (Byeongpungseok) and railings (Nanganseok). The stone screens are carved with the Twelve Zodiac Deities, Yeongjeo (vajra), and Yeongtak (vajra bell). Around the mounds are placed stone figures of civil officials (Munseokin), stone figures of military officials (Museokin), stone horses (Seokma), central stones (Jeongjungseok), long-life lamps (Jangmyeongdeung), stone tables (Honyuseok), stone pillars (Mangjuseok), stone sheep (Seogyang), and stone tigers (Seokho). Notably, the number of stone figures of civil officials, military officials, stone horses, stone sheep, and stone tigers is double that of other royal tombs, following the system of the Hyeon and Jeong Royal Tombs of King Gongmin of Goryeo and Princess Noguk. Below the tomb, in the stele pavilion (Sindobigak), there are two stele: one erected after King Taejong's death, and another erected in 1695 (the 21st year of King Sukjong's reign) to replace the original stele that had been damaged.