Gusuku in Okinawa represents a highly sophisticated technique using stones for various structures including the walls of the castles. Gusuku sites also provide a place for the people of Okinawa to worship their gods. Utaki worship is a unique religion that has been passed down from generation to generation.Utaki is a sacred place including the place known to be the beginning of the history of Okinawa, and natural objects are worshipped. During the period of the Kingdom of Ryukyu, Sonohyan-utaki and Sefa-utaki were recognized as the sacred places where the kingdom's religious rituals were performed.