It's rare that any Tran King's Tomb remains intact like Ngai Son Lang - Tomb of King Tran Hien Tong after 700 years Hanoi Travel: It is rare that any Tran King's tomb remains intact like Ngai Son Lang - Tomb of King Tran Hien Tong after 700 years #hnp #hanoipho #movuatran Ngai Son mausoleum (also known as Ai Lang) is the tomb of King Tran Hien Tong, 6th king of the Tran dynasty. The mausoleum is located at the foot of the mountain in Ao Beo area, Trai Loc 2 village, An Sinh commune, Dong Trieu town, about 500m west of the Tran Thai temple.