The ruins of Kuroki Palace at the top of Tennozan, a low hill facing Beppu Bay, on Oki-Nishinoshima Island in Shimane Prefecture is the site where Emperor Go-Daigo stayed when he was exiled to the Oki Islands.

In 1332, Emperor Go-Daigo raised the army to defeat the Kamakura Shogunate, whose power had been diminished by the two wars with Mongol, but he was defeated and banished to the Oki Islands. The emperor, however, escaped Oki within 2 years and succeeded in defeating the Shogunate this time. He returned to Kyoto and claimed power in what came to be known as the Kemmu Restoration.

At the foot of Tennozan is the history museum Hekifukan, where documents and pictures pertaining to the emperor are exhibited. Beside the ruins of Kuroki Palace is Kuroki Shrine, where Emperor Go-Daigo is enshrined. The ruins site is prefecturally designated as a historic site.