In 817 the great Buddhist monk Kobo Daishi Kukai selected Mount Koya as the training center for Shingon Buddhism. Since then hundreds of works of religious art were collected and preserved at Mount Koya, including treasures of Shingon Mikkyo itself and other forms of Buddhism, of Shinto, Shugen, and syncretic practice--each an expression of faith and many influential in the development of Japanese religious thought and culture. To commemorate the recent Koyasan Shingon Mission of Hawaii Cenntennial Celebration, a hundred of these works were exhibited for the first time outside Japan at the Honolulu Academy of Arts, the only venue for the exhibition in the United States. In Sacred Treasures of Mount Koya, color photographs and an explanation accompany each exhibit item. Dr. Willa Jane Tanabe (University of Hawai'i) contributes an essay on the complexities of Shingon Buddhist art, which are organized under four basic themes, thus providing a framework by which many of the pieces can be viewed meaningfully.