The royal mausoleum is located at the base of a cliff on the north side of Urasoe Castle. First built in the 13th century by King Eiso, the tomb was enlarged by King Sho Nei in 1620. Before WWII there was a tunnel called Kurashinujo (dark gate) that passed through the arch to the mausoleum garden. The tomb was enclosed in a high stone wall that gave it a solemn air but this was destroyed in the battles of WWII. At present excavation surveys are being conducted with the aim of reconstruction.