Tamawakasu-mikoto Shrine is the main shrine of the Oki Islands. It is built in the unique architectural style of the islands known as Oki-zukuri. Next to the shrine is the Oki-ke Traditional Residence, once home of the head priest for many generations. Today, with its thatched roof and other Oki-zukuri features, it serves as a museum offering insight into the shrine's history, such as the three separate entrances used by people according to their status. Among its many treasures is a 7th-century station bell that's the only one of its kind remaining in Japan.
Here, too, is one of Dogo Island's famous cedar trees, the Yao-sugi, which is an impressive 98-foot-tall tree and is thought to be almost 2,000 years old. Another esteemed Japanese cedar is the 800-year-old Chichi-sugi, revered as an ancient shrine dedicated to the goddess of maternity. The tree got its name ("chi-chi" means breasts) because of its mysterious bulging shape, with many new roots drooping downward from the tree's branches. Chichi-sugi stands near the peak of Mt. Daimanji on dry, rocky soil, but its dangling roots allow it to absorb moisture from the humid air, just one of many examples of the geopark's unique geological features.